How To Use Hornblende In A Sentence
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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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Aligned igneous minerals of euhedral potassium feldspar, plagioclase, biotite and hornblende in an undeformed quartz matrix define a magmatic foliation.
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Rhyolite dykes, which are commonly porphyritic with phenocrysts of either plagioclase or quartz, are intruded by dykes of hornblende tonalite, and the gabbro is likewise intruded by tonalite dykes.
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These microfaults are commonly pulled apart with growth of new quartz and biotite between pulled apart feldspar and hornblende.
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The sample is a weakly foliated granulite formed of plagioclase, orthopyroxene, clinopyroxene and minor hornblende.
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Dolerite, when composed entirely of augite and labradorite, produces rather inferior soils; but when it contains oligoclase and zeolites, and comes under the head of basalt, its disintegration is the source of soils remarkable for their fertility; for these latter substances undergoing rapid decomposition furnish the plants with abundant supplies of alkalies and lime, while the more slowly decomposing hornblende affords the necessary quantity of magnesia.
Elements of Agricultural Chemistry
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All four samples are medium-grained, and comprise variable proportions of hornblende, feldspar and quartz with accessory biotite and titanite.
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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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I observed neither hornblende, black schorl, nor rutile titanite, in this granite.
Travels to the Equinoctial Regions of America
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The general character of the rock here is sienitic; but, besides this peculiar quality of feldspar, the hornblende appears as actinolite, (ray-stone,) so called from the form of its crystallization; while the quartz element is faintly present, or appears in separate masses.
The Atlantic Monthly, Volume 15, No. 87, January, 1865
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The thrust sheet overlying the Delaney Dome Formation is composed of the basic Ballyconneely Amphibolite and interbanded quartz diorite and hornblende gneiss that intrude the Dalradian sediments.
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Structurally, therefore, these isles are a continuation of Land's End, but the granite has become less consistent and more friable; it is largely broken into felspar, quartz, and mica, with schorl, chlorite, and hornblende.
The Cornwall Coast
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They now knew that quicksilver was mercury, that red wulfenite, peacock coal, and hornblende were all minerals, that wild elephant’s ear, bladderwort, and stinking smut were plants, and that sunfish scales, flyclub, and phoenix feather were parts of animals.
The Night Of the Solstice
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Most significant is the presence of the Sinharaja Basic Zone, consisting of hornblende, pyriclasts, basic charnokites, pyroxene amphibolites and scapolite-bearing calc-granulites and blended with small amounts of quartzites, garnet-biotite gneisses and intermediate charnokites.
Sinharaja Forest Reserve, Sri Lanka
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The tonalite is characterized by a strong fabric defined by aligned plagioclase, hornblende and biotite that is interpreted to be a magmatic state deformation fabric formed during emplacement.
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During granitization, these elements are believed to be displaced and moved through the rock ahead of the granitization front, to form a zone enriched in minerals such as hornblende and pyroxene.
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Although each mound had substantial amounts of quartz and kaolinite, minerals that reflected differences in mound material included magnetite, gypsum, hornblende, hematite, goethite, and feldspars.
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Although dark minerals such as biotite and hornblende are usually present, giving the rock a speckled appearance, they are never abundant.
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The nature of the phonolites, which are lithoid lavas with a feldspar basis, and the nature of the green slates intermixed with hornblende, oppose this opinion.
Travels to the Equinoctial Regions of America
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One of the rarer minerals is hornblende, which is also found with crystals of quartz.
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In most of the intrusion, hornblende and biotite are both present, but occasionally either may constitute the sole mafic phase.
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The rock exposures are rather poor, except for some scattered inselbergs and massifs of biotite-hornblende gneisses.
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In the districts of the Nerbudda, we often see these black hornblende mortars, in which sugar-canes were once pressed by a happy peasantry, now standing upon a bare and barren surface of sandstone rock, twenty feet above the present surface of the culturable lands of the country.
Rambles and Recollections of an Indian Official
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The metabasites typically contain coarse-grained hornblende, biotite and plagioclase with accessory titanite.
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In addition some also contain hornblende and epidote, the latter in part replacing biotite.
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Attempts to separate hornblende from these diorites to date them failed utterly because of the intensive alteration of the hornblende to chlorite and epidote.
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The sample is weakly banded amphibolite-facies gneiss consisting of quartz, plagioclase, biotite and hornblende.
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The original hornblende crystals have partially decomposed to form a mesh of ortho- and clinopyroxene and extremely calcic plagioclase.
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I observed neither hornblende, black schorl, nor rutile titanite, in this granite.
Travels to the Equinoctial Regions of America
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The Henry Mountains consist of multiple intrusions of quartz-monzonite porphyries (predominantly plagioclasehornblende rocks) that were emplaced from 29.2 to 20.0 million years ago into a thick sequence of Mesozoic sediments.
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On the western side of the mesa, black hornblende xenocrysts several centimeters in size are also found in a scoriaceous, agglomeratic portion of the lava flow.
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If the stuff does not answer the magnet, it is probably schorl (tourmaline), hornblende, or dark quartz.
To The Gold Coast for Gold, Vol. II A Personal Narrative
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Calcic amphiboles, including hornblende and actinolite are abundant, and probably are alteration products, which also include albite, orthoclase and rare pyrite.
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In both these states I could not discover in it either garnets, hornblende, or diallage.
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 rock is dominated by well-oriented hornblende surrounding porphyroclasts of diopside, which is patchily transitional into hornblende.
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Many of the latter are magnetite, while the others are hornblende and various ferromagnesian silicates.
Aboriginal Remains in Verde Valley, Arizona Thirteenth Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1891-92, Government Printing Office, Washington, 1896, pages 179-262
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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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Late phases are mainly calcic amphiboles of magnesio-hornblende composition and plagioclases with very low anorthite contents.
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In many places basalt in piles and crumbling strata of hornblende schiste, disposed edgeways, green within, and without blackened by sun and rain, cropped out of the ground.
Personal Narrative of a Pilgrimage to Al-Madinah and Meccah
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Hornblende forms elongate prisms that define a lineation together with plagioclase.
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Cornishmen 'blue elvan:' this diorite, composed of felspar and the hardest hornblende, contains granular iron and pyrites like silver.
To The Gold Coast for Gold, Vol. II A Personal Narrative
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Some edenitic hornblende crystals contain cores of orthopyroxene.
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Their number is by no means large, and they all consist of mixtures in variable proportions of quartz, felspar, mica, hornblende, augite, and zeolites.
Elements of Agricultural Chemistry
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Hornblende and augite are two widely distributed minerals, which are so similar in composition and properties that they may be considered together.
Elements of Agricultural Chemistry
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They are divisible into two great classes, which have received the names of diorite and dolerite, the former a mixture of albite and hornblende, the latter of augite and labradorite, sometimes with considerable quantities of a sort of oligoclase containing both soda and lime, and of different kinds of zeolitic minerals.
Elements of Agricultural Chemistry
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The sample is a weakly foliated granulite formed of plagioclase, orthopyroxene, clinopyroxene and minor hornblende.
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Calcic amphiboles, including hornblende and actinolite are abundant, and probably are alteration products, which also include albite, orthoclase and rare pyrite.
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The sub-groups of this system are in the following succession upwards: - 1, hornblende slate; 2, chiastolite slate; 3, clay slate; 4, Snowdon rocks, (grawacke and conglomerates;) 5, Bala limestone; 6, Plynlymmon rocks, (grawacke and grawacke slates, with beds of conglomerates.)
Vestiges of the Natural History of Creation
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This is more especially true of chlorite, schorl, hornblende and augite.
A Text-book of Assaying: For the Use of Those Connected with Mines.
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The skarns also contain hornblende, calcite, pyroxene, tremolite, pyrrhotite, molybdenite, galena, chalcopyrite, arsenopyrite, garnet (probably andradite or grossular), and pyrite.
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The porphyry, which is of warm brown or chocolate colour, includes many crystals of lighter coloured felspar, and dark crystals of hornblende.
Gold, Sport, and Coffee Planting in Mysore
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The albite which the former contains undergoes a rapid decomposition, and yields abundance of soda along with some potash, which is seldom altogether wanting, while the hornblende supplies both lime and magnesia.
Elements of Agricultural Chemistry
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In the argil are imbedded small crystals of hornblende, or of mica, and thin pieces of quartz at most two lines square.
Travels in Syria and the Holy Land
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The granite is porphyritic with biotite and hornblende as important minerals and lies to the south of the contact; the gneiss lies to the north of the contact.
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Although each mound had substantial amounts of quartz and kaolinite, minerals that reflected differences in mound material included magnetite, gypsum, hornblende, hematite, goethite, and feldspars.
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There are, for instance, several different minerals commonly classified under the name of felspar, which have been distinguished by mineralogists by the names of orthoclase, albite, oligoclase, and labradorite; and there are at least two sorts of mica, two of hornblende, and many varieties of zeolites.
Elements of Agricultural Chemistry
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All four samples are medium-grained, and comprise variable proportions of hornblende, feldspar and quartz with accessory biotite and titanite.
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They are divisible into two great classes, which have received the names of diorite and dolerite, the former a mixture of albite and hornblende, the latter of augite and labradorite, sometimes with considerable quantities of a sort of oligoclase containing both soda and lime, and of different kinds of zeolitic minerals.
Elements of Agricultural Chemistry
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Not wulfenite and peacock coal and hornblende, they’re not.
The Night Of the Solstice
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Dark trappean rocks full of hornblende have in many places burst through these schists, and appear in nodules on the surface.
A Popular Account of Dr. Livingstone's Expedition to the Zambesi and Its Tributaries
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So you don't know the difference between augite and hornblende?" he once enquired.
South Wind
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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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The white chalkstone glitters from afar; the light grey feldspar assumes a warm flesh tint; the limestone becomes straw color; the crystals of hornblende flash like fire-flies; and the veins of white quartz, running with their nodules of serpentine and chlorite through the dark clay-slate, gleam as do chain lightnings through the clouds.
Life of Schamyl And Narrative of the Circassian War of Independence Against Russia
