How To Use Quartz In A Sentence
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A quartz watch powered by a battery is constantly powered and tells accurate time all the time and do not need time adjustment.
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I could perceive no trace of a metallic vein, so thoroughly had it been worked out, but scattered over the hillside with schist, talcose slate, and fragments of quartz, was a great deal of scoriae, showing that metal of some kind had been excavated, and that the smelting had been done on the spot.
Wanderings by southern waters, eastern Aquitaine
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Tian Hengshan 72 meters above sea level, Southeast and Dans associative, rock was also red ocher, belongs to the Sinian ferruginous quartzite.
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Here is nobly born quartz living with a green mineral, called epidote; and they are immense friends.
The Crown of Wild Olive also Munera Pulveris; Pre-Raphaelitism; Aratra Pentelici; The Ethics of the Dust; Fiction, Fair and Foul; The Elements of Drawing
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Just outside the pub, in Quartz Street, is The Braai & Meat, a small outdoor restaurant, with happy customers tucking into pap and braaied meat.
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Along the Leathad Riabhach gully, the Ben More Thrust steepens into a subvertical fault with gneiss to the NE and quartzite to the SW.
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Most soils are dominated by quartz sand, and are acidic, xeric, and have a very limited nutrient supply; they are coarser, drier, less fertile, and less suited to agriculture than the mesic soils of Ecoregion 84d.
Ecoregions of New Jersey (EPA)
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A quartz crystal resonator depends on the piezo-electric effect to work. This effect converts a mechanical stress in a crystal to a voltage and vice versa.
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Soft materials such as frits may require only 2-3 hours, whereas hard materials like quartz can take 24 hours or more.
8. Preparation of glazes
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The main constituent phases of these rocks are plagioclase, hornblende, pyroxene, quartz and K-feldspar, and accessory phases include magnetite, sphene, zircon and apatite.
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Survey, those of the Pallaballa range as mica schist and quartz; those of the Sierra del Cristal as “probably schistose grit, but not definitely determinable by inspection,” and
Travels in West Africa
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Grindstones can easily be made locally from 20 litres of good quality cement and 50 litres of quartzitic sand with 1 mm or smaller particle size.
Chapter 3
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It is traversed by veins of quartz, containing cannulated and often articulated prisms of rutile titanite two or three lines in diameter.
Travels to the Equinoctial Regions of America
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Browsing the shops is the main pastime: the stores offer rural knick-knacks and antiques as well as a fair amount of New Age wares such as quartz crystals, incense burners and Indian rugs.
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All the precious stones, except moonstone, opal and sphene, have at least the hardness of quartz, and can barely be scratched by metals, even by hard steel.
Scientific American Supplement, No. 1082, September 26, 1896
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Hundreds of fossils are locked in glass cases, specimens from all over southern Africa: shells and worms and nautiluses and seed ferns and trilobites, and minerals, too; yellow-green crystals and gleaming clusters of quartz; mosquitoes in drops of amber; scheelite, wulfenite.
Memory Wall
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Lepidolite, beryl, tantalite, quartz crystals, and altered and unaltered petalite are some of the minerals that can be found in this district.
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Sometimes the aikinite is altered, and fractures in the surrounding quartz are filled with thin blue and green films of azurite and malachite formed from the copper liberated by the aikinite.
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The quartzite shows granoblastic and blastopsammitic texture, with grain sizes varying from coarse sand to very fine pebble and with minor microcrystals of sericite, fuchsite, andalusite and iron oxide, besides detrital tourmaline, rutile, and zircon." link
Archive 2008-03-01
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This granulite consists of garnet, biotite, muscovite, quartz, plagioclase and cordierite.
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The results reveal that the main factor which influences the burnability is the grain size of crystal quartz.
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The museum has a Saudi sculpture of a falcon on a perch, of inestimable value and stunning vulgarity, made from gold, quartz, rubies, emeralds, sapphires and 1,210 diamonds.
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Two fifteenth-century icons set in beaten silver, studded with amethyst and quartz.
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We collected excellent crystals of tetrahedrite to 5 mm scattered on drusy quartz from a zone in the siliceous envelope of the orebody.
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To make the glyphs, the ancient carvers used chisels, probably of hard, fine-grained quartzite, which they struck with hammers of stone or antler, each blow chipping out one small stone flake.
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This town grew up to serve the gold mining industry and took its name from quartz-bearing reefs discovered in the area in 1871.
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A summary of quartz grain features is given in Fig. 5.11 and photomicrographs in Fig. 5.12.
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It discovered that the colors of several gem minerals - including pearl, sapphire, quartz, kunzite, and topaz - can be changed by the USPS irradiation method.
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The next few pockets yielded only dark blue apatite and clear to smoky to pale citrine quartz.
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Every miner wishes that his mine were upon this famous lode, which is made up of a large number of quartz veins extending along the western slope of the Sierra Nevada mountains, and is marked by hundreds of important mines.
The Western United States A Geographical Reader
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We detached with difficulty a fragment of cyanite from a block of splintered and milky quartz, which was isolated on the shore.
Travels to the Equinoctial Regions of America
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The sequence comprises Lower Ordovician conglomerates and carbonates overlain by Upper Ordovician to Middle Devonian limestone with occasional phyllite and quartzite.
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The quartzite shows granoblastic and blastopsammitic texture, with grain sizes varying from coarse sand to very fine pebble and with minor microcrystals of sericite, fuchsite, andalusite and iron oxide, besides detrital tourmaline, rutile, and zircon." link
Archive 2008-03-01
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Both the sandstone and andesite show strong quartz and chert veining and carry disseminated pyrite.
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Quartz fibres have two great advantages over other forms of suspension when employed for any kind of torsion balance, from an ordinary more or less "astatic" galvanometer to the Cavendish apparatus.
On Laboratory Arts
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The mineral assemblage comprises quartz, K-feldspar, albitic plagioclase, white mica, apatite, tourmaline and garnet.
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The depictions of birds and flowers were executed in precious materials including lapis lazuli, agate, Sicilian red and green jasper, chalcedony, amethyst and quartz as well as superb hard stones.
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Outside we saw large tables covered high with specimens of kyanite in quartz.
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Fragments of granite have been observed at Teneriffe; the island of Gomora, from the details furnished me by M. Broussonnet, contains a nucleus of micaceous schist: — the quartz disseminated in the sand, which we found on the shore of Graciosa, is a different substance from the lavas and the trappean porphyries so intimately connected with volcanic productions.
Travels to the Equinoctial Regions of America
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Like zircon, quartz, plagioclase, biotite and hornblende, major phenocryst phases, also show variable resorbtion effects.
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The Lake Superior iron formations now consist near the surface mainly of interbanded quartz (or chert) and hematite, called _jasper_ or _ferruginous chert_ or _taconite_.
The Economic Aspect of Geology
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Sinai, grey granite dyked with decaying porphyritic trap, and everywhere veined with white and various-coloured quartzes.
The Land of Midian
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The granite is dark red, often inclosing veins of quartz, crystallized and compact, and likewise well-formed crystals of schorl.
On the Old Road, Vol. 2 (of 2) A Collection of Miscellaneous Essays and Articles on Art and Literature
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John did this by waving a small quartz crystal pendulum over the resistor, which was either passing current, or not - depending on the position of a simple flip-flop relay inside the circuit box.
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Quartz is the dominant mineral in veins in siliceous rocks, calcite in limestones, and gypsum in gypsiferous sediments.
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Most such specimens are partially coated with a druse of calcite, epidote, and small, clear needle quartz crystals.
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The onyx is a variety of quartz analogous to the agate and other crypto-crystalline species.
The Catholic Encyclopedia, Volume 14: Simony-Tournon
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_ -- The whole formation is Archean and Primary (with a few modern plutonic outbursts), and chiefly consists of granite, felspar, quartz, gneiss, schists, amphibolite and other Archean rocks, with Primary sandstones and limestones in the basin of Lake Nyasa (a great rift depression), the river Shiré, and the regions within the northern watershed of the Zambezi river.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria"
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The changes of oxidant and anti-oxidant system of alveolar macrophage (AM ) of rats exposing to coal-quartz mixed dust were investigated in the developmental process of experimental anthracosilicosis.
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The white material is quartz and the black is the wall rock from the edge of the vein.
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In many cases, quartz overgrowths were preferentially corroded and dissolved in the presence of pyrophyllite, most likely during acidic metasomatism.
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Quartz is colourless when pure but minute amounts of impurities or lattice imperfections give rise to varieties such as amethyst, cairngorm, rose quartz, and smoky quartz.
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The pegmatite is composed of microcline, plagioclase and quartz with minor amounts of clinopyroxene, orthopyroxene, ilmenite and zircon.
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Although the quartz encrustation protects the calcite from dissolving, it obscures the twinned nature of the crystals, which is revealed by mechanical removal of the crust.
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Gold is associated with extensive zones of vuggy silica, quartz-alunite and quartz-dickite-kaolinite alteration.
Marketwire - Breaking News Releases
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A specimen from the replacement deposits of the Basin vein consists of several interlocking chalcopyrite crystals intergrown with clear quartz crystals.
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The second Expedition failed to find gold, but brought back argentiferous galena in copper-stained quartz, and possibly in the ochraceous red veins seaming the Secondary gypsum; with silicates and carbonates of copper: select specimens of the latter yielding the enormous proportion of forty per cent.
The Land of Midian
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It is dominated by variably foliated, medium-grained, even-textured to porphyritic biotite hornblende tonalite and quartz diorite.
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A greisen is a quartz - mica aggregate containing significant amounts of cassiterite, wolframite, fluorite, topaz, rutile, and tourmaline.
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Evidence comes from numerous quartz-filled fractures that crosscut the mylonitic foliation but recrystallized during deformation.
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So much for the western line; in the Portillo pass, proceeding eastward, we meet an immense mass of conglomerate, dipping to the west 45 deg, which rest on micaceous sandstone, etc., etc., upheaved and converted into quartz-rock penetrated by dykes from the very grand mass of protogine (large crystals of quartz, red feldspar, and occasional little chlorite).
More Letters of Charles Darwin — Volume 1
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Impressive blades and masses of lustrous micaceous hematite occur in localized quartz veins, and reniform goethite is found in the walls.
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Next, ‘age’ the inscription using an airbrush filled with quartz powder, before creating its ‘ancient’ patina by grinding stone into a watery paste.
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These crystals are associated with chalcopyrite, galena, quartz, calcite, epidote, and chlorite.
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They are made of chemo ceramic - a mixture of ceramic powder with 15 hardeners, including sodium bentonite, quartz and felspur, and burnt over 24 hours.
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The Borve Series is dominated by varieties of quartzo-feldspathic schist and gneiss, composed mainly of plagioclase, quartz, and biotite.
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The order of deposition for the main vein minerals typically is dolomite, barite, and quartz.
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Analcime may also be associated with quartz crystals, calcite, and common opal.
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The dominant non-clay mineral composition of the coarse fraction consists of biotite, quartz, and sanidine with lesser amounts of apatite and zircon.
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Furthermore, the crystal structure, surface characters of quartz and clinochlore, and the solution chemistry of oleic acid as the anionic collector were analyzed.
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If the bicarbonate is used, and heat is applied gradually, steam and carbonic acid are given off at a comparatively low temperature, and the carbonate is left; at a higher temperature (about 800° C., or a cherry-red heat) the carbonate fuses attacking the quartz, and giving off more carbonic acid; as the heat increases, and the attack on the quartz (which of itself is infusible) becomes complete, the whole mass settles down to a liquid sodium silicate, which is sufficiently fluid to allow the gold and lead to settle to the bottom.
A Text-book of Assaying: For the Use of Those Connected with Mines.
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Post et al. showed that quartz rheology is sensitive to water fugacity, but the above extrapolations do not apply to identical values of water fugacity.
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I have a fragment of their plaster postiche copying the close-grained Egyptian granite; the oily lustre of the quartz is so fresh and the peculiar structure of the rock, with its mica scintillations, so admirably rendered as to deceive, after two thousand years, the eye of a trained mineralogist.]
Old Calabria
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These, however, were sufficient to show me that the gneiss of Depilto was overlain conformably by the contorted schists; that the latter were followed by soft trappean beds, and these by thick beds of quartz-conglomerate, apparently derived from the degradation of the schistose rocks, with their numerous quartz veins.
The Naturalist in Nicaragua
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Let us suppose that a mine has been already opened; that a "lode" -- that is, a vein of quartz with metal in it -- has been discovered cropping out of the earth, and that it has been dug down upon from above, and dug in upon from the sea-cliffs.
Deep Down, a Tale of the Cornish Mines
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First, Jon placed an emerald, a diamond, a rose quartz, a ruby, an amethyst, and several chunks of jade in a circle outside the door that led to the chambers.
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By theory, [20] 50 grams of quartz will require 88.5 grams of the carbonate, or 140 grams of the bicarbonate, to form sodium silicate, which is a glassy, easily-fusible substance, making a good slag.
A Text-book of Assaying: For the Use of Those Connected with Mines.
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Wady Ruways, on whose left side was a large atelier, with broken walls and spalled quartz of the Negro variety.
The Land of Midian
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His feet kept slipping, and the handholds - tiny quartz crystal nubbins in the granite - were worn smooth and offered little purchase.
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Some composites such as precious opal protected between layers of quartz or glass are sold as such.
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Objective Recent research of piezoelectric quartz crystal ( PQC ) sensor and its applications in biomedicine in this review.
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The matrix is composed of microgranular quartz with some fibrous chalcedony.
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Radioactive elements in the sample or in the surrounding environment ionize the atoms in crystalline quartz, and the electrons become trapped by crystal defects.
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Quartz occurs as anhedral grains with irregular, sutured grain boundaries; subgrain development is common and neoblasts may be evident in more deformed bodies.
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The Park consists of a lateritic peneplain, with rock outcrops of quartz, schists and gneisses.
'W' National Park, Niger
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The main gangue minerals that make up the vein are massive white calcite, quartz, and prehnite.
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The Annascaul Formation is at least 500 m thick, and is dominated by mudrocks with subordinate quartz wacke sandstones, tuffaceous fine conglomerates and melange.
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Particularly significant are the jet, amber and quartz items, valued as mortuary goods from prehistoric times onwards for their electrostatic and refractive properties.
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This indurated metamorphic rock and its tectonic fabrics are cut across by several centimetre-scale cracks infilled by undeformed quartzitic matrix.
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A rod of quartz thus "tinned" can be soldered up to anything to which solder will stick, at once.
On Laboratory Arts
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It is simply titaniferous iron, iserine, pleonaste, ilmenite [Footnote: Or peroxide of iron, with 8 to 23 per cent, of blue oxide of titanium.] and degraded itabirite, the iron and quartz formation so called in the Brazil; and it is the same mineral which
To The Gold Coast for Gold, Vol. II A Personal Narrative
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- A fragment (or xenolith) of well mineralized intrusive within barren granodiorite was observed in drill hole MX07-03; - Disseminated molybdenite has recently been observed in intrusive rocks at the 805 mine level, currently below the Z zone described previously; and, - Strong quartz stockwork with molybdenite in biotite hornfels has been observed adjacent to the Ethel zone (Drill Hole MX07-01).
FinanzNachrichten.de: Aktuelle Nachrichten
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Their discovery of shocked quartz grains in a sandy layer in a Georgia kaolin mine documents the scatter of ejecta from the Chesapeake impact site.
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Plagioclase, microcline and quartz are the predominating minerals, while biotite, titanite, epidote, apatite, zircon and garnet are present in smaller quantities.
The Long Labrador Trail
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Strain shadows around feldspar porphyroclasts contain recrystallized potassium feldspar, plagioclase and quartz.
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All basalt chemical compositions can be plotted in the basalt tetrahedron, which has normative quartz, olivine, nepheline and augite at the apices.
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It is well cemented with early iron oxide, quartz overgrowth and clay cements with some dolomite blocking pore throats.
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We saw a pink quartz arrowhead and a scraper on one strew of fire-cracked rock.
Bird Cloud
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In this case the surrounding sediment matrix is dominated by detrital quartz and illite along with various other clay minerals.
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“This rock, which was so extensively employed by the Pueblo Indians for the manufacture of various utensils, has proved to be composed largely of quartz, intermingled with which is a fine, fibrous, radiated substance, the optical properties of which demonstrate it to be fibrolite.
Illustrated Catalogue Of The Collections Obtained From The Indians Of New Mexico And Arizona In 1879 Second Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1880-81, Government Printing Office, Washington, 1883, pa
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Setting quartz inclusions (at least the protogenetic and syngenetic ones) apart from your standard-issue nine-to-five mineral is the fact that they are stuck inside another growing mineral (quartz).
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Where pyrite crystals have been lost, it can be seen that quartz did not penetrate pyrite.
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One remarkable trait in the lode is the manner in which it splits into blocks and slabs, all the faces of the quartz pebbles being cloven in precisely the same plane.
To The Gold Coast for Gold, Vol. II A Personal Narrative
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The sample is strongly foliated and consists of garnet, biotite, quartz, plagioclase and cordierite.
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It includes a variety of rocks, such as basalt, granite, gneiss, quartzite, slate, and schist.
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The mineral assemblage is quartz + plagioclase + K-feldspar + biotite + cordierite + andalusite fibrolite.
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The lowest range above Djidda is calcareous; but its rocks soon change into gneiss, and a species of granite, with schorl in the place of feldspath, accompanied by predominant masses of quartz, and some mica.
Travels in Arabia
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The hanging-wall mylonite consists of an interconnected muscovite and chlorite network within a quartz-rich matrix.
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The limestone is highly fractured and contains abundant calcite and quartz veins.
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Quartz pulls a hypodermic filled with a clear sparkling liquid out of his bag.
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The gossan is likely to resist erosion and to be conspicuous at the surface, -- though this depends largely on the relative resistance of the wall rocks, and on whether the gangue is a hard material like quartz, or some material which weathers more rapidly like limestone or igneous rock.
The Economic Aspect of Geology
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We've known for decades that homes on or near the Reading Prong made up of granitic gneiss, granodiorite, and quartzite had elevated levels of radon.
You can stop envying your neighbor's granite countertops now.
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Instead, silica is found in polymerized combinations with metals as silicates embedded in geologic rock formations, such as quartz.
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According to Tinka Resources Ltd., press release dated January 24, 2007, mapping and prospecting has outlined a 1,000 by 800 metre area hosted by granodiorite and quartz monzonite of the Coastal Batholith which intruded Jurassic and Cretaceous sediments and volcanic.
Marketwire - Breaking News Releases
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Substrate here consists largely of hard, slow-weathering Precambrian quartzose rocks.
Tasmanian temperate rain forests
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The sample is composed of K-feldspar, plagioclase and quartz with accessory apatite, magnetite, titanite, zircon and secondary epidote.
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The many semi-precious stones which have a quartz basis (such as the varieties of waxy or cryptocrystalline chalcedony which is largely quartz in a very minutely crystalline condition) are often even tougher than the clear crystallized quartz.
A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public
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quartz crystal is perfectly crystallized
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In the Western zone and the contiguous Hooper Complex, turbiditic quartz wacke was deposited on the Kimberley Craton between c. 1872 and 1865 Ma.
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At the foot of Hance Rapid, the river leaves Marble Canyon; its regular and stately sandstones, shales, limestones, and quartzites tower higher and higher above, while the river quickly incises itself a thousand feet into the black and pegmatite-veined Precambrian schists of the Inner Gorge.
President Garfield's "spine, removed during autopsy, was passed around to jurors during the trial of his assassin."
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Quartz and gypsum are other familiar examples of crystalline structures.
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C-S fabrics and asymmetric quartz boudins parallel to these lineations suggest top-to-the-NE or top-to-the-east directed shear consistent with the general directions observed in the Baidrag Gol Transect.
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The concretion matrix is dominantly an interlocking mosaic of calcite, ferroan dolomite and quartz.
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Heaney expected to find that the quartz in tiger's-eye was chalcedony, a form that typically consists of fibrous, defect-riddled crystals less than 1 micrometer in diameter.
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The natural materials include the minerals staurolite, quartz, diamond and corundum.
Garnet
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The geological formation of the country we had passed through, consisted in the higher ranges of an argillaceous rock, of quartz, or of ironstone.
Journals of expeditions of discovery into Central Australia, and overland from Adelaide to King George's Sound, in the years 1840-1
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The granite rocks of the glacial valley contain quartz veins of silver, lead and zinc and at one time there were over 2 000 miners toiling there.
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The radium-bearing minerals are torbernite and autunite (hydrous copper-uranium and calcium-uranium phosphates), and are found in dark felsite dikes near their intersections with east-west gold-silver-quartz veins.
The Economic Aspect of Geology
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The microgranite has a felsitic groundmass containing microphenocrysts of albite and orthoclase along with phenocrysts of corroded quartz and sporadic dihedral garnet.
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When minerals such as quartz and feldspars have received a radiation dose and are then heated, they emit light.
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They are primarily quartzite, granite, and granitized schists.
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Wolframite crystals 5-15 cm long were scattered throughout the vein along with numerous cavities or ‘pockets’ with crystals of quartz and wolframite.
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Here, too, the veins may be monomineralic, commonly quartz or calcite, but more usually are polymineralic with a mixture of metalliferous sulphide or oxide minerals and gangue minerals.
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The foliation is marked by chloritc, white mica and minute quartz grains.
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All experiments were made in quartz cuvettes, and the sample solutions were kept at constant stirring during the measurements.
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The depictions of birds and flowers were executed in precious materials including lapis lazuli, agate, Sicilian red and green jasper, chalcedony, amethyst and quartz as well as superb hard stones.
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There is much chlorite growth, but quartz is only very poorly recrystallized.
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Although pearls, of varying colours, are the main material Tuck uses, she also includes quartzes and some precious stones such as garnet and amethyst.
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The sharp relief of the mountains, with their grass-covered summits, precipitous slopes and flat open piedmont, is formed by a ridge of iron-quartzite emerging from softer metamorphic rocks.
Mount Nimba Strict Nature Reserve, Guinea and Côte d'Ivoire
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Because they formed within the peat, coal balls generally contain very little detrital clay minerals and quartz.
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The same tendency to rely upon color causes many in the trade to call all yellow stones "topaz" whether the species be corundum (oriental topaz), true topaz (precious topaz), citrine quartz (quartz topaz), heliodor (yellow beryl), jacinth
A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public
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This phenomenon, called the piezoelectric effect, has been well known in certain crystals for more than a century and is the driving force behind quartz clocks and other applications.
PhysOrg.com - latest science and technology news stories
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Then we have the "amethyst" sapphire, which varies from a red to a blue purple, being richer in colour than the ordinary amethyst, which is a form of violet-coloured quartz, but the corundum variety, which, like its companions, is called the "oriental" amethyst, is both rarer and more precious.
The Chemistry, Properties and Tests of Precious Stones
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The main ore minerals are galena, chalcopyrite, sphalerite, and tetrahedrite that are associated with quartz and barite gangue.
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The Grenadiers consist of upthrusted blocks of Precambrian Quartzite and slate.
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The basement is mainly composed of quartz biotite norite and minor serpentinite which belong to the Ordovician Boganclough intrusion.
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Where's that piece of rose quartz that's supposed to help me nod off?
Times, Sunday Times
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Several miles further on a solitary upstanding column of rock represented an opossum man who rested here, looked about the country, and left spirit children behind him; a low range of remarkably white quartzite hills indicated a large number of white ant eggs thrown here in the _wingara_ [146] by the Munga-munga women as they passed across the country.
The Belief in Immortality and the Worship of the Dead, Volume I (of 3) The Belief Among the Aborigines of Australia, the Torres Straits Islands, New Guinea and Melanesia
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Its quartz hills are covered with trees and gigantic grasses; the buaze, a small forest-tree, grows abundantly; it is a species of polygala; its beautiful clusters of sweet-scented pinkish flowers perfume the air with a rich fragrance; its seeds produce a fine drying oil, and the bark of the smaller branches yields a fibre finer and stronger than flax; with which the natives make their nets for fishing.
A Popular Account of Dr. Livingstone's Expedition to the Zambesi and Its Tributaries
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The Ogallala quartzite and other local flakes tend to be substantially larger, thicker, and heavier; have wider, frequently corticate platforms; and retain a greater percentage of cortex coverage on their dorsal faces.
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It contains a variety of lithologies including augen gneiss, quartzite, amphibolite, calc-silicate, pelite and marble.
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Their hearing is so acute that they can hear the pulsing sound of a quartz crystal in a digital clock.
Times, Sunday Times
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Coexisting MI phases in these rocks include garnet, plagioclase, quartz, tourmaline and fluorite.
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More accurate clocks based on the regular vibrations of a quartz crystal superseded them.
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Water, doubly distilled over quartz, was purified by Milli-Q Plus system (Millipore, Bedford, MA).
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Monazite clusters occur in a variety of host minerals, including cordierite, quartz, biotite and andalusite.
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All five rock samples are mineralogically simple, and comprise mainly muscovite, quartz and feldspar with accessory epidote and biotite.
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Her collection is not much but it includes mica, aquamarine, tourmaline, rubies and rose quartz.
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The ultramafic and mafic intrusive rocks are cut by very few quartz veins and have not been found to host beryl or emerald.
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The ironstone is locally represented by hematite matrix-supported vein quartz breccia.
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Hesse and Thuringia, a quartzitic sandstone prevails in the lower part.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary"
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Quartz is the dominant mineral in veins in siliceous rocks, calcite in limestones, and gypsum in gypsiferous sediments.
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The quartz grains are well-rounded and often show frosted, pitted surface textures.
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He was a world leader in quartz crystals.
Times, Sunday Times
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Small quartz grains are unstrained, and notable for the abundance of tiny fluid inclusions, some with vapour bubbles.
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The geological constitution consists mainly of quartzite schists, gneisses, limestones, and isolated granitic and diabasic intrusions.
Venezuelan Andes montane forests
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The radium-bearing minerals are torbernite and autunite (hydrous copper-uranium and calcium-uranium phosphates), and are found in dark felsite dikes near their intersections with east-west gold-silver-quartz veins.
The Economic Aspect of Geology
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It is underlain by schist, phyllite, and quartzite, although outcrops of serpentine are common in the area.
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The ancient Brazilian shield underlying the forest presents a gently undulating plain framed by scenic quartzitic ridges and mountains of Precambrian origin aligned in a generally NW to SE direction.
Chiquitano dry forests
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Radiating fringe of feldspar in groundmass is in optical continuity with phenocryst, from which it nucleated. (e) Quartz phenocryst is surrounded by feldspar groundmass.
Granophyre_photos.html
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Quartz commonly forms polycrystalline ribbons; undulatory extinction, dynamic recrystallization and grain-boundary migration are widespread.
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Faience is a glass-like material, made by heating a paste consisting of sand or crushed quartz, an alkali such as plant ash, and a glaze, until vitrification occurs.
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In the mid-1880s, Pierre Curie had used minuscule quartz crystals to craft an instrument called an electrometer, capable of measuring exquisitely small doses of energy.
The Emperor of All Maladies
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The sun caught a piece of quartz in the granite and lit the brilliance embedded there.
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In the latter locality arsenopyrite is found associated with pyrite in a gangue of quartz, forming a series of parallel stringers in gneiss close to a basic dike.
The Economic Aspect of Geology
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The mineral is found as small pink to gray masses of microcrystals in quartz-feldspar pegmatites and veins in association with astrophyllite, riebeckite, and zircon.
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We there found some fine specimens of blue carbonated copper mingled with sulphate of barytes and quartz; but we could not ourselves judge whether the ore contained any argentiferous fahlerz, and whether it occurred in a stratum, or, as the apothecary who was our guide asserted, in real veins.
Travels to the Equinoctial Regions of America
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This article introduce a new method to make the latent fingerprints emerge by using the iodine heat-sublimating spray-gun heated by a sort of quartz lamp.
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A specialized supplier of special timepiece tools an mechanical and quartz movements from Japan and Switzerland.
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In this rock, you get the recrystallization and foliation of quartz, feldspars, micas, and amphiboles into alternating light - and dark-colored bands.
Metamorphic rock
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The intervening host-rock layers are between 2 and 5 cm thick, being composed of biotite, sillimanite, garnet, muscovite, quartz and plagioclase.
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They often have grown around pre-existing acicular goethite crystals in random orientation, clearly demonstrating the quartz to be of a later growth.
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The company has also engaged in extensive in-house testing and experimentation on a wide range of metals, plastics, acrylics, and quartz.
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Mylonitic rocks usually have ribbon quartz and rotated albite porphyroclasts.
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The Possibility of replacement of feldspa and quartz by feldspa-quartzose stone was studied in glazed tile production.
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This is a fine-grained quartz sandstone with clayish matrix.
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Made of sand-like quartz, sandstone comes in a variety of colors.
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Plutonites, also magmatic, form in conditions of extreme heat and pressure far deeper within the Earth; colourful translucent crystals such as aventurine, peridot and rose quartz are the result.
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Nor will it satisfactorily explain the auriferous antimonial silica veins of the New England district, New South Wales, in which quantities of angular and unaltered fragments of slate from the enclosing rocks are found imbedded in the quartz.
Getting Gold: a practical treatise for prospectors, miners and students
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All granitoids in the footwall of the Simav detachment are dominated by medium - to coarse-grained granite, granodiorite, quartz monzonite, diorite and syenogranite.
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Flow margins are often altered, containing abundant epidote and amygdales with quartz, calcite and/or chlorite.
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Water, doubly distilled over quartz, was purified by Milli-Q Plus system (Millipore, Bedford, MA).
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During the Ming and Qing periods (1368-1911) marble, malachite, turquoise, yellow quartz, soapstone and became popular with collectors for their colorful appearance.
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They consist mostly of quartz and feldspars, with a little mica or amphibole.
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It is a reddish brown sandstone formed by detrital quartz, plagioclase, feldspar and muscovite, with subordinate apatite, zircon and opaque minerals.
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Their quartz clock was a very large device as compared with today's quartz wristwatches which also use microchip and liquid crystal display technology.
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Both Wadi Sikait and Regal Ridge classify as Type I emerald deposits, where Be-bearing quartz or pegmatite veins from a granitic pluton intruded Cr- or V-bearing mafic or ultramafic rocks.
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No, not as in igneous, granite, marble or quartz, but as in I just spent 5 days in Guadalajara and had a rockin 'good time.
Guadalajara Rocks!
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The nonzeolites apophyllite, calcite, and quartz commonly occur at many localities.
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Faience is a glass-like material, made by heating a paste consisting of sand or crushed quartz, an alkali such as plant ash, and a glaze, until vitrification occurs.
