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How To Use Biotite In A Sentence

  • This granulite consists of garnet, biotite, muscovite, quartz, plagioclase and cordierite.
  • From Pliocene time the shallow emplacement of intrusive bodies resulted in thermal metamorphism (forming, for example, biotite, cordierite, andalusite, K-feldspar and corundum in pelites) and hydrothermal activity.
  • Like zircon, quartz, plagioclase, biotite and hornblende, major phenocryst phases, also show variable resorbtion effects.
  • In the metamorphosed Thunderhead Sandstone it was found that at the staurolite isograd, the boundary between the garnet and staurolite zones, the mineral chlorite disappears from the rocks and muscovite decreases sharply, whereas staurolite appears and biotite becomes more abundant. Ken Miller in Cleveland: WEBCAST ARCHIVE URLS - The Panda's Thumb
  • In the metamorphosed Thunderhead Sandstone it was found that at the staurolite isograd, the boundary between the garnet and staurolite zones, the mineral chlorite disappears from the rocks and muscovite decreases sharply, whereas staurolite appears and biotite becomes more abundant. Ken Miller in Cleveland: WEBCAST ARCHIVE URLS - The Panda's Thumb
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  • It is dominated by variably foliated, medium-grained, even-textured to porphyritic biotite hornblende tonalite and quartz diorite.
  • The Borve Series is dominated by varieties of quartzo-feldspathic schist and gneiss, composed mainly of plagioclase, quartz, and biotite.
  • The dominant non-clay mineral composition of the coarse fraction consists of biotite, quartz, and sanidine with lesser amounts of apatite and zircon.
  • Biotite and epidote occur as secondary minerals.
  • The more altered dykes of the Black Coast have groundmasses of clinopyroxene, plagioclase and rare biotite.
  • It is unclear when the biotite gneisses were imbricated with the cover units or what controlled the imbrication.
  • - 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
  • More commonly, anhedral masses are found interleaved with giant biotite crystals.
  • 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
  • Textures of kyanite, xenotime and monazite, and some staurolite and biotite, indicate that peak metamorphic mineral growth occurred after D 2 deformation.
  • Garnet is typically recrystallized and is wrapped around by biotite.
  • The sample is strongly foliated and consists of garnet, biotite, quartz, plagioclase and cordierite.
  • The mineral assemblage is quartz + plagioclase + K-feldspar + biotite + cordierite + andalusite fibrolite.
  • 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.
  • The spotted textures are marked by the growth of biotite, cordierite and andalusite on the metamorphic foliation.
  • That suit of schist contans a large number of abundant aluminium mineral: staurolite, almandine and biotite, so the primitive is mostly clayrock.
  • The basement is mainly composed of quartz biotite norite and minor serpentinite which belong to the Ordovician Boganclough intrusion.
  • Monazite clusters occur in a variety of host minerals, including cordierite, quartz, biotite and andalusite.
  • All five rock samples are mineralogically simple, and comprise mainly muscovite, quartz and feldspar with accessory epidote and biotite.
  • Although biotite is capable of this, other minerals such as muscovite, garnet and cordierite are more efficient and preferentially occur in strongly peraluminous rocks.
  • Dacite and granodiorite contain slightly more biotite and amphibole minerals than granite and rhyolite. Igneous rock
  • These inclusions were found within the cleavage planes of the crystal structure of the biotites.
  • The intervening host-rock layers are between 2 and 5 cm thick, being composed of biotite, sillimanite, garnet, muscovite, quartz and plagioclase.
  • Petrographical evidence establishes that peak thermal metamorphism produced largely random growth of kyanite, staurolite, biotite, monazite and xenotime that overprinted those fabrics.
  • Although biotite is capable of this, other minerals such as muscovite, garnet and cordierite are more efficient and preferentially occur in strongly peraluminous rocks.
  • It is composed of quartz, oligoclase, and microcline, with minor garnet, biotite, muscovite and iron-oxides.
  • The mica group of minerals includes: biotite, muscovite, lepidolite, and phlogopite. Vermiculite
  • Coeval gabbro intrusions are composed of unlayered, fine- to medium-grained, biotite-bearing norite, gabbronorite, gabbro and diorite.
  • Biotite is sometimes pseudomorphed by chlorite and epidote, and garnet is absent.
  • The colour is clear and some inclusions of biotite and melt are present.
  • All monazite grains are located in the rock matrix, which consists of quartz, muscovite, biotite, epidote, chlorite, plagioclase, potassium feldspar and garnet with a granoblastic texture.
  • Zircon (variety cyrtolite) commonly forms curved tetragonal crystals that radiate from a base of biotite crystals and terminate in adjacent feldspar.
  • Foliation-parallel quartz veins are cross-cut and extended along microfaults, the sense of offset indicating the same shear sense as indicated by the biotite rhombs.
  • In this method, clear sticky tape was pressed firmly into sample areas and rapidly pulled away, removing thin flakes of biotite with the tapes.
  • Detailed elemental and isotopic studies of this crystal fractionation pathway have indicated the importance of mafic phases, notably calcic clinopyroxene and biotite.
  • This crystal was glassy and was found associated with smoky quartz, microcline-perthite, biotite, zircon, bastnasite, and limonite after siderite.
  • Mesosomes are invariably associated with a leucosome component and are composed of biotite accompanied by fibrolite, minor quartz, plagioclase and retrograde muscovite and chlorite.
  • Granite sample RHGI can be modelled by continuing this felsic scheme, for example with 22% fractionation of oligoclase, amphibole, biotite and the usual minor apatite and titanite.
  • 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.
  • The principal minerals are, plagioclase, biotite and microcline, with smaller quantities of quartz, iron oxide, pyroxene and garnet. The Long Labrador Trail
  • Associated with the quartz are crystals of almandine, kyanite, biotite, and magnesite.
  • It consists of quartz, K-feldspar, plagioclase, biotite and white mica, and in places displays a graphic texture.
  • All four samples are medium-grained, and comprise variable proportions of hornblende, feldspar and quartz with accessory biotite and titanite.
  • The dike is characterized by a greater abundance of muscovite than biotite; it also contains columbite-tantalite, cassiterite, beryl, spodumene, lepidolite, montebrasite, pollucite, and tourmaline.
  • Secondary titanite, chlorite, white mica and pyrrhotite are abundant, and some samples contain metamorphic biotite.
  • Secondary titanite, chlorite, white mica and pyrrhotite are abundant, and some samples contain metamorphic biotite.
  • The spotted textures are marked by the growth of biotite, cordierite and andalusite on the metamorphic foliation.
  • The semi-pelites usually consist of biotite, quartz, plagioclase and untwinncd feldspar, and garnet forms abundant porphyroblasts in some varieties.
  • Biotite shows the same pleochroism as in the granodiorite.
  • Monazite clusters occur in a variety of host minerals, including cordierite, quartz, biotite and andalusite.
  • Biotite occurs as interstitial grains with strong pleochroism from light yellowish-green to dark brown.
  • Biotite, containing haloes, 223; pleochroism of, 235; intensified pleochroism in halo, 235. The Birth-Time of the World and Other Scientific Essays
  • 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
  • Sericite alteration is ubiquitous within the sheared rocks, and fuchsite and biotite have been observed locally. The Earth Times Online Newspaper
  • Although dark minerals such as biotite and hornblende are usually present, giving the rock a speckled appearance, they are never abundant.
  • All monazite grains are located in the rock matrix, which consists of quartz, muscovite, biotite, epidote, chlorite, plagioclase, potassium feldspar and garnet with a granoblastic texture.
  • 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.
  • A dark red, finely laminated rock consisting chiefly of decomposed biotite and feldspar, occasional quartz grains and sericite and much iron oxide. The Long Labrador Trail
  • - 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
  • Caledonian granites nearby the Second Power Dam of Jinshuikou in East Kunlun consist of cordierite granite and biotite granodiorite.
  • 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
  • Fine-grained biotite, muscovite and recrystallized quartz grains define the shear foliation.
  • Also, diamond is well known as host for a wide variety of inclusions such as graphite, magnetite, ilmenite, garnet (usually pyrope), chrome-diopside, chlorite, biotite, phlogopite, and even corundum.
  • The biotite-granite continues these trends of increasing orthoclase over plagioclase and biotite over homblende, to produce a coarse-grained pink porphyritic rock in which orthoclase phenocrysts dominate.
  • The sample contains the mineral assemblage garnet, staurolite, biotite and rare epidote.
  • Willman reported astrophyllite, biotite, molybdenite, and riebeckite associated with smoky quartz and microcline (variety amazonite) on Mount Kineo at North Cheyenne Canyon.
  • A large pebble with a gneissose appearance is a retrograded orthogneiss, consisting of quartz, plagioclase, feldspar and muscovite, with relics of biotite, mostly chloritized, and a weakly folded tectonic foliation.
  • Furthermore, the textural evidence implies that the main hydrous minerals in this rock, staurolite and biotite, largely predate garnet growth.
  • All four samples are medium-grained, and comprise variable proportions of hornblende, feldspar and quartz with accessory biotite and titanite.
  • Quartz, microcline or orthoclase and plagioclase are ubiquitous in the Everest granites, which also contain varying amounts of tourmaline, muscovite, biotite and garnet.
  • This granulite consists of garnet, biotite, muscovite, quartz, plagioclase and cordierite.
  • The Bakfjord Granite contains quartz, K-feldspar, biotite, plagioclase, epidote, allanite, muscovite and occasional garnet.
  • Biotite and amphibole lineations on the cleavage plane plunge consistently SW or WSW.
  • This is because this mineral was always observed as fine-grained inclusions parallel to the cleavage of biotite crystals.
  • The matrix is dominantly felsic, but also contains biotite, muscovite, epidote and titanite.
  • The thick Thunderhead Sandstone (Upper Precambrian Great Smoky Group) in the Great Smoky Mountains along the Tennessee/North Carolina border was deformed and regionally metamorphosed during formation of the Appalachian Highlands, beginning in the so-called Devonian (that is, early in the Flood year).12-14 With increasing temperatures and pressures from northwest to southeast, the regional metamorphism produced in these sandstone layers a series of chemically and mineralogically distinct zones of schists and gneisses.15 These zones are named according to the first appearance of the distinctive metamorphic minerals which characterize them as the intensity of the metamorphism increased laterally—the biotite, garnet, staurolite, and kyanite zones. Ken Miller in Cleveland: WEBCAST ARCHIVE URLS - The Panda's Thumb
  • Quartz, feldspar, white mica and biotite are all major constituents.
  • - Strong quartz stockwork with molybdenite in biotite hornfels has been observed adjacent to the Ethel zone (Drill Hole MX07-01). Undefined
  • The stretching lineation is commonly defined by biotite and by recrystallized plagioclase in tails surrounding rotated, moderately retrograded, garnet porphyroclasts.
  • The rock consists of plagioclase, K-feldspar, quartz, clinopyroxene and biotite, with abundant apatite, and ilmenite.
  • These microfaults are commonly pulled apart with growth of new quartz and biotite between pulled apart feldspar and hornblende.
  • Aligned igneous minerals of euhedral potassium feldspar, plagioclase, biotite and hornblende in an undeformed quartz matrix define a magmatic foliation.
  • The deposit was interpreted to have formed by the replacement of biotite by vermiculite under the influence of pegmatitic fluids.
  • Willman reported astrophyllite, biotite, molybdenite, and riebeckite associated with smoky quartz and microcline (variety amazonite) on Mount Kineo at North Cheyenne Canyon.
  • Secondary titanite, chlorite, white mica and pyrrhotite are abundant, and some samples contain metamorphic biotite.
  • The titanite grains from Zones 1 and 2 show marginal growth interstitial to newly grown crystals of metamorphic minerals such as plagioclase, biotite and zoisite.
  • A fine grained compact gray rock, of aggregate structure, consisting chiefly of quartz, plagioclase and biotite, and the alteration products epidote and sericite. The Long Labrador Trail
  • Biotite, epidote and clinopyroxene are also occasionally present, whereas garnet is virtually absent.
  • In most of the intrusion, hornblende and biotite are both present, but occasionally either may constitute the sole mafic phase.
  • The rock exposures are rather poor, except for some scattered inselbergs and massifs of biotite-hornblende gneisses.
  • The sample is strongly foliated and consists of garnet, biotite, quartz, plagioclase and cordierite.
  • Weiya complex, eastern Tianshan: Single - sourced or diverse - sourced ? -- Evidence from biotite.
  • The metabasites typically contain coarse-grained hornblende, biotite and plagioclase with accessory titanite.
  • Some biotite crystals form perfectly euhedral plates, others show a reaction rim rich in opaque granules towards the surrounding microfelsitic base.
  • A notable exception is andalusite-biotite assemblages in the Mulhacen nappe of the Nevado-Filabride complex, though even these are largely replaced by Alpine kyanite, staurolite and garnet.
  • Mica — A group of minerals, including muscovite or "isinglass" and biotite or black mica. Tseh So, a Small House Ruin, Chaco Canyon, New Mexico :
  • In addition some also contain hornblende and epidote, the latter in part replacing biotite.
  • The dike is characterized by a greater abundance of muscovite than biotite; it also contains columbite-tantalite, cassiterite, beryl, spodumene, lepidolite, montebrasite, pollucite, and tourmaline.
  • The central potassic zone is characterized by the presence of potassium-bearing minerals such as orthoclase (a potassium feldspar) and biotite.
  • The sample is weakly banded amphibolite-facies gneiss consisting of quartz, plagioclase, biotite and hornblende.
  • This granulite consists of garnet, biotite, muscovite, quartz, plagioclase and cordierite.
  • They contain olivine, clinopyroxene, plagioclase, analcite, ulvospinel and apatite + / - biotite + / - calcite.
  • Major mineral phases include plagioclase and pyroxene, with small amounts of opaque minerals, olivine, apatite, and sometimes biotite.
  • The more pelitic samples contain euhedral orthopyroxene residual biotite, and dendritic ilmenite grains.
  • The Stephens Creek Shear Zone contains a peak assemblage of garnet-plagioclase-staurolite-biotite, with staurolite overgrowing garnet.
  • This granulite consists of garnet, biotite, muscovite, quartz, plagioclase and cordierite.
  • Associated with the quartz are crystals of almandine, kyanite, biotite, and magnesite.
  • It is not possible to relate individual biotite grains to any variations in the petrological characteristics of the UG - 2 layer, which are known to occur along strike.
  • Sillimanite, which occurs both as fibrolite and as prismatic grains, grows across the L-S fabric in part defined by biotite, and is clearly post-kinematic with respect to the type - 1 tectonites.
  • Leucosomes and leucogranites that segregated over variable distances but remained within the migmatites contain entrained inclusion-rich biotite from proximal mesosome-melanosome.
  • Group names, such as Biotite, are both boldface and italicized.
  • Accessory chlorite, magnetite or ilmenite, titanite, apatite, partly chloritized biotite, epidote, pyrite and sometimes cummingtonite, are present.

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