How To Use Pegmatite In A Sentence
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Acicular crystals and crystal aggregates of pyrolusite are found in vugs in the pegmatites of the district.
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Apatite is the most common phosphate mineral found in granitic pegmatites.
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Nb-dominant kupletskite and, similarly, Zr-rich astrophyllite in the altered pegmatites are thought to be extremely late-stage phases, the result of remobilization of Nb and Zr by postmagmatic deuteric fluids.
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In graphic granite and in pegmatites, perthite is of common occurrence.
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A fellow that he knows showed us a bucketful of aquamarines and two large garnets and then took us for a short walk to the pegmatites on his farm.
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The latter do not include typical pegmatite minerals and appear mainly along the tectonic fractures present at this locality.
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They collected several pegmatite pockets in which topaz was associated with both clear and smoky quartz, microcline, albite, muscovite, fluorite, and cassiterite.
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The dark green color of the emerald required chromium, an element not normally found in granitic pegmatites but often in good supply in ultramafics.
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He went up and took a look at the cliff and rock chimneys above the pegmatites, but he didn't like heights.
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They collected several pegmatite pockets in which topaz was associated with both clear and smoky quartz, microcline, albite, muscovite, fluorite, and cassiterite.
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A common misconception is that a pegmatite is granitic in composition.
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Autunite is widespread in the eastern United States and is particularly well known as an accessory in complex pegmatites that have been prospected for mica, feldspar, spodumene, and gems.
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In places, they contain blocks and fragments of surrounding lithologies as well as isolated boudins of granite pegmatite.
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Indeed, pegmatites from gabbros to granites to carbonatites to anorthosites are known.
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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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Whitmore owns the Palermo mines in North Groton, N.H., a source of the granite-type rock known as pegmatite, as well as about 150 other minerals including whitmoreite, named in his honor.
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Very large sheets or crystals of muscovite form in a pegmatite.
Mica
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A swarm of mafic igneous dikes have intruded the Estes pegmatite and make a showy display in the quarry face.
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Very large sheets or crystals of muscovite form in a pegmatite.
Mica
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The sample was collected from a 0.5 - Im wide pegmatite pocket in a partly retrograded, undeformed part of an equigranular, medium - to coarse-grained gabbro at Lavikdal.
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The most important sources of sheet mica are the pegmatite deposits.
Mica
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He reported finding wulfenite, cerussite, anglesite, plattnerite, and massicot as alteration products of galena in three pegmatites at Saint Peters Dome.
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This mineral is typical of a special igneous rock known as a pegmatite.
Cesium
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Coarse granite (known as pegmatite) often breaks up in weathering, leaving large pieces of quartz and feldspar lying on the ground.
6. Obtaining glaze materials
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Large anhedral masses of yttrian fluorite, measuring to several feet across, were found at the White Cloud pegmatite.
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Huge crystals of excellent color are still being found here in pegmatites.
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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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It is a large area of granite hills in which numerous pegmatites have been found through the years.
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A swarm of mafic igneous dikes have intruded the Estes pegmatite and make a showy display in the quarry face.
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Both of these minerals are typical of a special igneous deposit known as a pegmatite.
Rubidium
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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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A pegmatite is an extremely slow-cooling igneous rock in which very large crystals can form.
Mica
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The flake mica produced in the U.S. comes from several sources: the metamorphic rock called schist as a by-product of processing feldspar and kaolin resources, from placer deposits, and from pegmatites.
Mica
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It is also a widespread constituent of a variety of igneous and metamorphic rocks and is occasionally found in pegmatites and in related veins marginal to igneous rock units ranging from granite to diabase.
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The wall rocks to the pegmatites consist of a sequence of mafic volcanics and gabbroic intrusive bodies.
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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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This is a coarsegrained biotite gneiss with an average granodioritic composition, that is generally fairly homogeneous but locally shows gneissic banding, and is intruded by veins of microgranite and pegmatite.
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There were several specimens in it that I can still recall acutely, one of which was spodumene collected from a New England pegmatite.
About.com Geology
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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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Pale brown to yellow xenotime and zircon are abundant as fine crystals up to 2 mm in length in many of the miarolitic granite cavities as well as in pegmatite pockets.
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Although no spectacular or highly valuable minerals are present, the pegmatites contain minerals seldom found in Wyoming, such as petalite, beusite, lepidolite, and tantalite.
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Aplite and pegmatite sills and dykes are also common demonstrating that a metasomatic volatile-rich phase played an important role in leucogranite migration.
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In contrast, granitic pegmatites are found in the Zomba Mountain and Malosa Mountain.
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A volatile-rich metasomatic phase produced late growth of poikilitic K-feldspars, layered pegmatites and aplite dikes and an explosive network of dykes emanating out of the top of the Nuptse-Everest leucogranite.
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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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Ed would drill by hand and blast away the rock, exposing the pegmatite.
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Pegmatite is important to collectors because it often contains crystals such as aquamarine, topaz and tourmaline, Howe said.
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Commercial quantities of spodumene are in a special igneous rock deposit that geologists call a pegmatite.
Lithium
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She notes that lime-green to purplish-green modified fluorite octahedra have been found at this pegmatite.
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Allanite, fluorite, topaz, yttrotantalite, and zircon have all been found in pegmatites in the Stove Mountain area.
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Smoky quartz, topaz, and microcline variety amazonite from the Pikes Peak Granite and beryl variety aquamarine from Mount Antero are well-known Colorado gemstones from pegmatites.
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Beryl, columbite, and triphylite are common accessory minerals in the Estes pegmatite, especially in the coarse-grained layers.
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It has also been found as a constituent of granites and in granitic pegmatites.
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In most rocks feldspar is in too small grains and is too intimately associated with other minerals to be of commercial importance; in only one type of rock, pegmatite, which is an igneous rock of extremely coarse and irregular texture, are the feldspar crystals sufficiently large and concentrated to be commercially available.
The Economic Aspect of Geology
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The largest spodumene crystal ever found was found in a pegmatite in South Dakota.
Lithium
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It has also been found as a constituent of granites and in granitic pegmatites.
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They collected several pegmatite pockets in which topaz was associated with both clear and smoky quartz, microcline, albite, muscovite, fluorite, and cassiterite.
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In one of the creeks I observed pegmatite; pebbles of talc-schiste and of white quartz covered the bed of the river.
Journal of an Overland Expedition in Australia : from Moreton Bay to Port Essington, a distance of upwards of 3000 miles, during the years 1844-1845
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At the Serrie and McGuire pegmatites, large opaque white to pale blue euhedral topaz crystals were found in the core-margin zone.
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At the B-Q claims, beryl occurs with dark red garnet, smoky quartz, and black tourmaline in miarolitic cavities in a granite pegmatite dykes that cuts across the foliation of a high-grade metamorphic gneiss.
