How To Use Pyroxene In A Sentence
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Other variants include feldspar-pyroxene-phyric lava and, rarely, aphyric lava.
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The magmatic evolution is dominated by low-pressure crystal fractionation of olivine, Cr-spinel, plagioclase and clinopyroxene.
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In addition to quartz, fluid inclusions can occur in carbonates, gypsum, halite, fluorite, feldspar, garnet, pyroxene, amphibole, tourmaline, olivine, and sphalerite; indeed in most minerals except phyllosilicates.
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Geochemically, the pyroxene nephelinite is highly enriched in LILE compared with the first one.
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Biotite, epidote and clinopyroxene are also occasionally present, whereas garnet is virtually absent.
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The majority of the rhyolites are porphyritic and contain phenocrysts of one or more of the following: plagioclase, clinopyroxene, magnetite, quartz and sanidine, plus accessory apatite and zircon.
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Pyroxene is exclusively diopsidic augite, with a composition relatively colse to the diopside - hedenbergite join.
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The majority of the rhyolites are porphyritic and contain phenocrysts of one or more of the following: plagioclase, clinopyroxene, magnetite, quartz and sanidine, plus accessory apatite and zircon.
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Several igneous dikes and sills have been intruded into this sedimentary sequence, the largest of which is the Great Whin Sill, a quartz-orthopyroxene dolerite of late Carboniferous age.
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Pyroxene, quartz and augite form the groundmass, as seen in section.
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The rock consists of plagioclase, K-feldspar, quartz, clinopyroxene and biotite, with abundant apatite, and ilmenite.
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The sample is a weakly foliated granulite formed of plagioclase, orthopyroxene, clinopyroxene and minor hornblende.
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Observations by Spirit show the rock contains significant amounts of the minerals olivine, pyroxene and magnetite, all of which are common in some types of volcanic rock.
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Most samples are very altered, with olivines and orthopyroxenes being strongly serpentinized.
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In samples consisting mainly of feldspars, clinopyroxene, garnet or amphibole occur as sub - to anhedral grains and grain sixes become smaller.
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The original home of platinum is in basic igneous rocks, such as peridotites, pyroxenites, and dunites, where it has been found in small, scattered crystals intergrown with olivine, pyroxene, and chromite.
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Early attempts applying the Sm-Nd isotope system to garnet and clinopyroxene were encouraging and often yielded dates considered as representing near-peak P-T conditions.
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In agreement with published literature, amphibole and pyroxene appeared to dissolve ahead of feldspar.
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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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This flow consists of about 30 percent plagioclase, clinopyroxene, and olivine, as small phenocrysts.
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Figure parts a-e with crossed nichols. (a) Micrographic groundmass surrounds feldspar phenocryst fragment. (b) Micrographic groundmass around clinopyroxene phenocryst.
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It is home to glasses, pyroxenes, feldspars, oxides, olivines, troilite and metals in its lunar soil, which is called regolith.
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This flow consists of about 30 percent plagioclase, clinopyroxene, and olivine, as small phenocrysts.
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In these occurrences the tungsten mineral is almost invariably scheelite, and is associated with calcite, garnet, pyroxene, and other silicates.
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They contain olivine, clinopyroxene, plagioclase, analcite, ulvospinel and apatite + / - biotite + / - calcite.
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The next most common minerals are silicates, such as mica, feldspar, pyroxene, and the olivines, which break down to clay, the soluble elements they contain being mostly carried away in solution.
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Ye et al. recently reported abundant exsolutions of clinopyroxene, rutile and apatite in garnet of a Yangkou eclogite sample.
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Other common minor constituents of eclogite include kyanite, orthopyroxene, rutile, amphibole, pyrite, and white mica.
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The more pelitic samples contain euhedral orthopyroxene residual biotite, and dendritic ilmenite grains.
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There appear to be a number of different possible mechanisms for the pigeonite - orthopyroxene transformation.
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Feldspar with a basis of souda (compact feldspar) forms, with diallage, the euphotide and serpentine; with pyroxene, dolerite and basalt; and with garnet, eclogyte.
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Some amphibolies were also presented, although less frequently than the pyroxenes.
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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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Feldspar with a basis of souda (compact feldspar) forms, with diallage, the euphotide and serpentine; with pyroxene, dolerite and basalt; and with garnet, eclogyte.
Travels to the Equinoctial Regions of America
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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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Major mineral phases include plagioclase and pyroxene, with small amounts of opaque minerals, olivine, apatite, and sometimes biotite.
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Chain silicates are called pyroxenes or inosilicates.
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The majority of the rhyolites are porphyritic and contain phenocrysts of one or more of the following: plagioclase, clinopyroxene, magnetite, quartz and sanidine, plus accessory apatite and zircon.
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This sample contains large plagioclase and pyroxene crystals, some of which have a sponge-like texture.
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They are basaltic flows rich in zeolites and phenocrysts (plagioclase, olivine and pyroxene), and intercalated with strombolian and phreatomagmatic deposits.
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Associated minerals include various pyroxenes and zeolites in addition to the more familiar lazurite, sodalite, pyrite, and carbonates.
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Pyroxene crystallites in boninite matrix possess peculiar dendritic morphological features in the Xiangcheng area, western Sichuan.
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The greenschist-facies overprint resulted in the growth of actinolitic amphiboles, plagioclase and titanite at the expense of pyroxene and rutile or ilmenite.
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Serpentine is a secondary mineral, a magnesian silicate, formed from minerals such as olivine and orthopyroxene.
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Pigeonite is the orthorhombic pyroxene equivalent in the volcanic rocks.
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As cooling continues, plagioclase (a mixture of two kinds of aluminum silicates) and the pyroxene mineral augite (a magnesium silicate mixed with some iron) form.
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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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A bleb of glass with clinopyroxene and plagioclase is located below and to the right of the large plagioclase phenocryst.
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C peridotite and dunite the upper mantle is composed of ultramafic rock called peridotite which is mostly olivines and pyroxenes.
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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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Detailed elemental and isotopic studies of this crystal fractionation pathway have indicated the importance of mafic phases, notably calcic clinopyroxene and biotite.
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The sample is a weakly foliated granulite formed of plagioclase, orthopyroxene, clinopyroxene and minor hornblende.
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That the Fe-Mg equilibrium between garnet and clinopyroxene records high temperatures, indicates that early elemental compositions were preserved through the lower temperature part of the P-T-t path.
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Some edenitic hornblende crystals contain cores of orthopyroxene.
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Layered intrusions commonly occur with mafic intrusions where the minerals (such as olivine, pyroxene, chromite, magnetite and plagioclase) have a wider range of specific gravity, and the magma viscosity was low.
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Magma modelling showed that olivine nephelinite and basanite could form by different degrees of partial melting of the mantle source, with amphibole, garnet, olivine and clinopyroxene in the residuum.
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The latter form by dehydration melting at less than 10-12 kbar leaving a residue of augite, orthopyroxene, plagioclase and varying amounts of amphibole.
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Calcium-rich species in the wollastonite area are not pyroxenes but pyroxenoids.
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Other common minor constituents of eclogite include kyanite, orthopyroxene, rutile, amphibole, pyrite, and white mica.
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The magmatic evolution is dominated by low-pressure crystal fractionation of olivine, Cr-spinel, plagioclase and clinopyroxene.
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The crustal differentiation processes were dominated by fractionation of olivine, chrome spinel, plagioclase and clinopyroxene, leading to evolved compositions.
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Fractionation of ferromagnesian phases such as olivine, pyroxene and magnetite must have taken place during magma emplacement, as is suggested by the low Co abundance.
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The most fundamental characteristic of tholeiites is the presence of a low-Ca pyroxene (e.g., hypersthene).
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Here it is believed to be an alteration product of diopside (lime-magnesia pyroxene) in a contact-metamorphic silicated zone.
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Pyroxene mineralogy evolves along two paths with near end-member hedenbergite phenocrysts in the groundmass and aegirine solid solution in miaroles.
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We are not, it appears to me, more justified in applying the term telluric to the nickel and iron, the olivine and pyroxene (augite), found in meteoric stones, than in indicating the
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Second, in a process known as differentiation, crystals of olivine, clinopyroxene, and plagioclase began to crystallize from the magma, and being more dense than the magma, they settled to the bottom of the chamber.
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The more altered dykes of the Black Coast have groundmasses of clinopyroxene, plagioclase and rare biotite.
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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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Figure parts a-e with crossed nichols. (a) Micrographic groundmass surrounds feldspar phenocryst fragment. (b) Micrographic groundmass around clinopyroxene phenocryst.
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BRONZITE, a member of the pyroxene group of minerals, belonging with enstatite and hypersthene to the orthorhombic series of the group.
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I was staring a Ca-rich plagioclase and pyroxenes and ilmentite.
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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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Most of the xenoliths from the southern plug cluster show the development of small clinopyroxene crystals, and one xenolith contains small quantities of finely recrystallized olivine.
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This is consistent with the fact that olivine is typically entrapped in pyroxene and amphibole crystals.
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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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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 rock was of garnet gneiss, traversed by black dykes of pyroxene granulite.
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Therefore, pyroxene is the next mineral to start forming after olivine.
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Blocks of anorthoclase - and clinopyroxene-bearing micorgaphic granophyre (click for photo) were ejected with rhyolitic pumice during a late-Pleistocene eruption at the Alid volcanic center, Eritrea.
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Diamonds sometimes contain minute inclusions of the minerals garnet, olivine, and pyroxene, which indicate formation in two major mantle rock-types, peridotite and eclogite.
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The samples from the andesitic units, occurring as tectonic lenses in the greywacke sequence, exhibit plagioclase phenocrysts altered to sericite, calcite and epidote, set in a matrix of chloritized pyroxene and amphibole.
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In practice many basalts also contain easily visible crystals of feldspar, pyroxene, olivine, or amphibole.
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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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It has been suggested that the ultrabasic rocks, containing olivine, magnesium-rich pyroxenes, and amphiboles are first altered by hydrothermal processes to form the serpentine minerals; in a later metamorphic event, the serpentines are partially redissolved and crystallized as chrysotile fibers.
Geology of asbestos
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A usually coarse - grained igneous rock composed chiefly of calcic plagioclase and pyroxene.
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Orthopyroxene forms in primitive (high-MgO) basalts but as differentiation proceeds, it is replaced by pigeonite once the enstatite component falls below 60 to 70 atomic percent.
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Basalt is a fine-grained igneous rock that is primarily composed of the iron- and magnesium-rich minerals pyroxene and olivine and calcium-rich plagioclase feldspar.
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These rocks are composed predominantly of the minerals plagioclase feldspar, amphibole, and pyroxene.
Igneous rock
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Associated minerals include various pyroxenes and zeolites in addition to the more familiar lazurite, sodalite, pyrite, and carbonates.
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Extreme cases are found in mineral groups such as apatite, amphibole, pyroxene, feldspar, and tourmaline.
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Various factors, including magma composition, control whether orthopyroxene or pigeonite occurs as the low-Ca pyroxene, but high temperatures yield orthopyroxene and low-pressure crystallization favours pigeonite.
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Unbrecciated diogenite that shows orthopyroxenes and chromite grains that are partially fragmented and deformed.
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The principal minerals are, plagioclase, biotite and microcline, with smaller quantities of quartz, iron oxide, pyroxene and garnet.
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