How to use plagioclase in a sentence

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Sentence Examples The more altered dykes of the Black Coast have groundmasses of clinopyroxene, plagioclase and rare biotite. This flow consists of about 30 percent plagioclase, clinopyroxene, and olivine, as small phenocrysts. The magmatic evolution is dominated by low-pressure crystal fractionation of olivine, Cr-spinel, plagioclase and clinopyroxene. They typically comprise early olivine and plagioclase, ophitically enclosed by augite, with opaque oxides and apatite. The original porphyritic texture with plagioclase phenocrysts is still recognizable. The siltstones contain poorly sorted angular fragments of quartz, and angular clasts and cleavage fragments of plagioclase and alkali feldspar. The sample is a weakly foliated granulite formed of plagioclase, orthopyroxene, clinopyroxene and minor hornblende. The rock consists of plagioclase, K-feldspar, quartz, clinopyroxene and biotite, with abundant apatite, and ilmenite. Tauride dykes contain less calcic plagioclase than their host cumulates, like the Kinik ophiolites. Like zircon, quartz, plagioclase, biotite and hornblende, major phenocryst phases, also show variable resorbtion effects. The metabasites typically contain coarse-grained hornblende, biotite and plagioclase with accessory titanite. The pegmatites are composed of K-feldspar, quartz, plagioclase and biotite, with titanite, opaque minerals and apatite as accessory minerals. The Bakfjord Granite contains quartz, K-feldspar, biotite, plagioclase, epidote, allanite, muscovite and occasional garnet. Strain shadows around feldspar porphyroclasts contain recrystallized potassium feldspar, plagioclase and quartz. Some of the studied rocks show high alumina characteristics probably reflecting the high modal content of very calcic plagioclase. Coexisting MI phases in these rocks include garnet, plagioclase, quartz, tourmaline and fluorite. The Borve Series is dominated by varieties of quartzo-feldspathic schist and gneiss, composed mainly of plagioclase, quartz, and biotite. The plagioclase crystals would have formed subcircular lenses of anorthosite that punctuated background chromite accumulation. Hornblende forms elongate prisms that define a lineation together with plagioclase. It consists of clasts of angular to rounded quartz, plagioclase, tourmaline and rock fragments, up to 3 mm in diameter. Show More Sentences The pegmatite is composed of microcline, plagioclase and quartz with minor amounts of clinopyroxene, orthopyroxene, ilmenite and zircon. The mineral assemblage comprises quartz, K-feldspar, albitic plagioclase, white mica, apatite, tourmaline and garnet. The sample is composed of K-feldspar, plagioclase and quartz with accessory apatite, magnetite, titanite, zircon and secondary epidote. The plagioclase feldspar weathers to produce a whitish gray rock, while the mafic minerals produce contrasting darker grains. A bleb of glass with clinopyroxene and plagioclase is located below and to the right of the large plagioclase phenocryst. 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. The intervening host-rock layers are between 2 and 5 cm thick, being composed of biotite, sillimanite, garnet, muscovite, quartz and plagioclase. Feldspar is dominated by microcline, but plagioclase and perthitic feldspar are also present. The most common phenocryst silicate phases are olivine, plagioclase and augite, typically, although not always, appearing in that order. A plagioclase feldspar, albite probably, occurs as parallel growths of transparent colorless to yellowish crystals. This sample contains large plagioclase and pyroxene crystals, some of which have a sponge-like texture. They have a mineralogical association of quartz, diopside, actinolite, plagioclase and K-feldspar. The sample is strongly foliated and consists of garnet, biotite, quartz, plagioclase and cordierite. It consists of quartz, K-feldspar, plagioclase, biotite and white mica, and in places displays a graphic texture. Major mineral phases include plagioclase and pyroxene, with small amounts of opaque minerals, olivine, apatite, and sometimes biotite. Several small grains of amphibole were seen as inclusions in a plagioclase phenocryst, and one partial grain of resorbed amphibole also was noted. The first phase of diagenetic albite constitutes an impure, turbid variety including albitized grains of original plagioclase and alkali feldspar. They have a porphyritic texture with prismatic plagioclase phenocrystals, small, aciculate plagioclase crystals and a partially devitrified, near-opaque matrix. The Johnstown meteorite is classified as a calcium-poor diogenite, being composed mainly of hypersthene, with minor amounts of plagioclase and olivine. Show More Sentences If the magma is about 60 percent plagioclase feldspar and 35 percent mafic minerals, the intrusive rock diorite or the extrusive rock andesite will be formed. 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. Minerals typical of the rocks of the epidote-amphibolite facies include biotite, almandite garnet, plagioclase, epidote, and amphibole. Olivine is typically associated with calcic plagioclase, magnesium-rich pyroxenes, and iron-titanium oxides such as magnetite and ilmenite. Myrmekite also occurs after the rock crystallizes by replacement of the plagioclase during metasomatism or hydrothermal alteration. The volcanics were described by Aghabawa as alkaline basalts, hawaiites and mugearites with plagioclase, olivine and augite as the essential constituents. The crustal differentiation processes were dominated by fractionation of olivine, chrome spinel, plagioclase and clinopyroxene, leading to evolved compositions. Thus the order of phenocryst appearance in Kilauea lavas is olivine, plagioclase, augite whereas in Mauna Loa lavas it is olivine, augite, plagioclase. The term moonstone also has been applied to the plagioclase feldspars peristerite and labradorite, which also exhibit iridescence. These lavas also contain large crystals of olivine, plagioclase, and pyroxene that crystallized deep within the Earth's crust and mantle. It is a reddish brown sandstone formed by detrital quartz, plagioclase, feldspar and muscovite, with subordinate apatite, zircon and opaque minerals. The semi-pelites usually consist of biotite, quartz, plagioclase and untwinncd feldspar, and garnet forms abundant porphyroblasts in some varieties. Aligned igneous minerals of euhedral potassium feldspar, plagioclase, biotite and hornblende in an undeformed quartz matrix define a magmatic foliation. The primary importance of plagioclase, however, derives from its role in rock formation. Hydrothermal alteration and partial plagioclase sericitisation occurred during cooling of the intrusive rocks. This aqueous fluid has to be rich in aluminium to allow crystallisation of aluminosilicate and plagioclase in such abundance. The greenschist-facies overprint resulted in the growth of actinolitic amphiboles, plagioclase and titanite at the expense of pyroxene and rutile or ilmenite. The stretching lineation is commonly defined by biotite and by recrystallized plagioclase in tails surrounding rotated, moderately retrograded, garnet porphyroclasts. As cooling continues, plagioclase and the pyroxene mineral augite form. The main constituent phases of these rocks are plagioclase, hornblende, pyroxene, quartz and K-feldspar, and accessory phases include magnetite, sphene, zircon and apatite. Show More Sentences Quartz, microcline or orthoclase and plagioclase are ubiquitous in the Everest granites, which also contain varying amounts of tourmaline, muscovite, biotite and garnet. The latter form by dehydration melting at less than 10-12 kbar leaving a residue of augite, orthopyroxene, plagioclase and varying amounts of amphibole. Monocrystalline grains consist mostly of oligoclase andesite plagioclase and subordinately of quartz, calcite, biotite, magnetite, iron hydroxides and microcline. With an increase in calcic plagioclase and mafic minerals the rock type becomes a diorite. Andesite is an aphanitic and extrusive igneous rock composed of the Na-rich plagioclase, pyroxene and amphibole. Feldspar separates consisted of alkali feldspar, either albitic plagioclase or potassium feldspar, or mixtures of both. Igneous brown amphibole is ubiquitous as rims around cumulus plagioclase, olivine and pyroxene, and locally forms interstitial grains. Members of the plagioclase feldspar series range from almost pure white in albite through light gray to darker gray toward the anorthite end-member. Quartz monzonite differs from granodiorite by containing more alkali feldspar, usually more biotite and less hornblende, and oligoclase instead of andesine as the plagioclase mineral. Kaolinization of the feldspar has also occurred in the oxidized beds, although it primarily involved the plagioclase. Mafic volcanic rocks are dominantly basaltic and typically contain augite and plagioclase phenocrysts. In calcareous rocks the minerals found include plagioclase, diopside, grossularite, vesuvianite, wollastonite, and sometimes the more complex calcium silicates monticellite, melilite, spurrite, tilleyite, and clinohumite. Depending upon the composition of plagioclase, this facies may be subdivided into two subfacies, the albite-epidote-amphibolite subfacies and the oligoclase-epidote-amphibolite subfacies. Labradorite, a feldspar mineral in the plagioclase series that is often valued as a gemstone and as ornamental material for its red, blue, or green iridescence. One of the Chandrayaan 1's findings, reported in September 2009, was a confirmation of the mineral anorthite, rich in calcium plagioclase. The small clusters of coarse pyroxene and plagioclase are also found near contacts, including individual large rounded grains of augite. Euhedral to subhedral zoned oligoclase to andesine plagioclase and anhedral quartz, in small pods, are the primary constituents of the rock. When a granitoid is devoid or nearly devoid of plagioclase, the rock is referred to as alkali feldspar granite. Subhedral plagioclase is slightly to extensively altered to saussurite and sericite. The feldspar fraction is dominantly altered orthoclase feldspar and perthitic ortho-clase feldspar with traces of microcline and plagioclase. Show More Sentences Most samples contain albitic plagioclase, and relict pyroxene is common in mafic rocks. For example, the boundary between the greenschist and amphibolite facies marks a transition from amphibole of actinolitic composition to hornblende and of a sodic plagioclase into a more calcic plagioclase. The presence of anomalously large plagioclase crystals, which may be xenocrysts, is the main reason for the success of those sites while other sites are not. Strong influx of water-rich fluids during pre-Triassic cataclasis led to albitisation of the plagioclase, and not to its replacement by clay minerals as observed in the Leuggern and Böttstein boreholes. The copper-gold mineralization of the Chuchi deposit is centred on a cluster of plagioclase porphyry monzonite stocks, dykes and sills. We note that whereas the clinopyroxene is fresh, the plagioclase is variably altered to albite and stilbite. The flow is a coarse-grained, ophitic basalt containing heavily altered plagioclase and relatively unaltered clinopyroxene. The sills contain small pseudomorphs of olivine, plus plagioclase and clinopyroxene phenocrysts. The main minerals in the sample are quartz, perthitic orthoclase, plagioclase with sericite, epidote and chlorite. These are two types of feldspars of which plagioclase feldspars are more abundant than K-feldspars like orthoclase and microcline. Unit G is composed of sparsely to moderately porphyritic basalt, with gabbroid xenoliths, plagioclase glomerocrysts and olivine microphenocrysts. They have porphyritic texture with plagioclase phenocrystals in a subophitic to intersertal groundmass. The plagioclase crystals are nearly euhedral and vary between 4 and 6 mm in length. Basalt fiber is a material made from extremely fine fibers of basalt, which is composed of the minerals plagioclase, pyroxene and olivine. But it's got more plagioclase than they're seeing on the surface of Mercury and it plots funny in 'oxygen isotope space. Large poikilitic hornblende and in some cases plagioclase overgrow the cumulates. A plagioclase glass in some chondrites and irons formed by preterrestrial impact between meteorites in space. The main minerals used for this classification according to their presence or absence are: quartz, alkali feldspar, plagioclase and others minerals such as mica, amphibole, pyroxene and olivine. At somewhat higher temperatures, the rock would become an amphibolite, reflecting a mineralogy composed predominantly of the amphibole hornblende along with plagioclase and perhaps some garnet. From 495m to end of hole at 500m a weakly altered and mineralized, late plagioclase hornblende diorite porphyry was intersected. Show More Sentences Amphibole, diopside, epidote, plagioclase, almandine and grossular garnet, and wollastonite are minerals typically found in rocks of the amphibolite facies. For instance, a granite that is formed from melted sediments may have more alkali feldspar, whereas a granite derived from melted basalt may be richer in plagioclase feldspar. These clasts are essentially ophiolitic consisting of serpentine, olivine, pyroxenes, plagioclase and amphiboles with minor of cherty made up of microquartz and mega quartz. Specifically, they are located within the Scrag Lake biotite monzogranite pluton in which quartz, K-feldspar, plagioclase, and biotite are the major mineral constituents. These rocks have a granoblastic texture with a domain of quartz and plagioclase of different shapes and sizes, showing evidence of recrystallization. Its amount increases abruptly close to the contacts of the anorthosites with silicic rocks, where perthitic alkali feldspar partly replaces plagioclase. Examples from Classical Literature Essentially it is a crystalline-granular compound of plagioclase, generally Labradorite and diallage. Sometimes 584 the striae on crystal-faces are due to repeated lamellar twinning, as in the plagioclase felspars. The former consist mainly of plagioclase, leucite and augite, while the latter contain olivine in addition. Many dolerites are porphyritic and carry phenocrysts of olivine, augite and plagioclase felspar. More rarely biotite and augite exhibit the same relations to the plagioclase. The felted or hyalopilitic texture is the most common, and plagioclase is the principal groundmass constituent. There is also some variation in the amount of quartz present, and in the relative importance of the orthoclase and plagioclase. The finished implements found were two axes, of a plagioclase igneous rock, and three arrow points, all of quartzite. The plagioclase crystals vary greatly in size, some being mere microliths while others are over the eighth of an inch in length. On the right hand side part of a plagioclase crystal with inclosures similar to that in the preceding figure. Find more words! 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