| This is followed by ophitic or poikilitic crystallization of pyroxene and ilmenite about scarce nuclei, produced at lower temperatures. |
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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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| Geochemically, the pyroxene nephelinite is highly enriched in LILE compared with the first one. |
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| This is consistent with the fact that olivine is typically entrapped in pyroxene and amphibole crystals. |
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| This sample contains large plagioclase and pyroxene crystals, some of which have a sponge-like texture. |
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| Extreme cases are found in mineral groups such as apatite, amphibole, pyroxene, feldspar, and tourmaline. |
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| In practice many basalts also contain easily visible crystals of feldspar, pyroxene, olivine, or amphibole. |
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| The most fundamental characteristic of tholeiites is the presence of a low-Ca pyroxene. |
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| The phenocrysts of rhyolite may include quartz, alkali feldspar, oligoclase feldspar, biotite, amphibole, or pyroxene. |
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| The garnet is rich in the high-pressure species pyrope, and the omphacite is rich in the high-pressure pyroxene jadeite. |
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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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| 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 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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| As cooling continues, plagioclase and the pyroxene mineral augite form. |
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| The rock that forms the heart of Mount Royal contains large black crystals of augite, a variety of pyroxene, proof that it cooled slowly. |
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| The main resonances of crystalline pyroxene at 9.2 µm and crystalline olivine at 11.3 µm are clearly seen in the HD 142527 spectrum. |
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| These lavas also contain large crystals of olivine, plagioclase, and pyroxene that crystallized deep within the Earth's crust and mantle. |
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| Secondary minerals vary, including mica, amphibole, pyroxene, apatite, zircon and tourmaline. |
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| Several sculptors work in both stone, pyroxene principally, and whale bone. |
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| Basalt is usually black and mainly contains the following minerals: olivine, pyroxene and amphibole. |
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| Therefore, pyroxene is the next mineral to start forming after olivine. |
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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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| Pigeonite is the orthorhombic pyroxene equivalent in the volcanic rocks. |
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| The mineralogy of pyrolite is 57 per cent forsteritic olivine, 17 per cent enstatitic pyroxene, 12 per cent diopsidic pyroxene, and 14 per cent pyropic garnet. |
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| The skarns also contain hornblende, calcite, pyroxene, tremolite, pyrrhotite, molybdenite, galena, chalcopyrite, arsenopyrite, garnet, and pyrite. |
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| Pyroxenes outside the quadrilateral all have monoclinic pyroxene structures similar to that of diopside. |
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| Peridotite: magmatic rock of color green blacky made up of olivine, pyroxene and spinel with sometimes the presence of biotite and garnet. |
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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 most important minerals in chondrites are olivine and pyroxene. |
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| Biotite, actinolite, chlorite and talc formed at the expense of primary olivine and pyroxene that are not preserved. |
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| The magma is responsible of the formation of skarns with garnet, pyroxene, amphibole and magnetite in the ore bodies, and of the presence of veins of dacite or dolerite within the host rocks. |
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| There are a number of silicate minerals, pyroxenoids, which have a similar Si O ratio as pyroxene, but with structures that are not identical as the chains of silicon tetrahedra do not infinitely repeat. |
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| Andesite or diorite minerals, such as andesine with either pyroxene or amphibole, crystallize next and are followed by orthoclase and quartz, which are the essential constituents of rhyolite or granite. |
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| Johannsenite, silicate mineral in the pyroxene family. |
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| A pyroxene with a green colour similar to the emerald one. |
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| Most samples contain albitic plagioclase, and relict pyroxene is common in mafic rocks. |
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| 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. |
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| The most abundant silicate minerals on Earth's surface include quartz, feldspars, amphibole, mica, pyroxene and olivine. |
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| Fine grained sedimentary rocks were transformed into hornfels and minerals such as amphibole, pyroxene. |
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| Within this granite are darker bands richer in iron because they contain the pyroxene mineral aegirine and the amphibole mineral riebeckite. |
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| Higher iron and magnesium tends to manifest as a darker groundmass, and also occasionally amphibole or pyroxene phenocrysts. |
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| Serpentinite consists essentially of antigorite locally with relict pyroxene, minor magnetite, crisotile and carbonate veins. |
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| Andesite is an aphanitic and extrusive igneous rock composed of the Na-rich plagioclase, pyroxene and amphibole. |
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| Kyanite, garnet, monazite, and amphibole are common minerals, while apatite, anatase, titanite, corundum, pyroxene, and epidote are rare. |
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| Igneous brown amphibole is ubiquitous as rims around cumulus plagioclase, olivine and pyroxene, and locally forms interstitial grains. |
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| Basalt fiber is a material made from extremely fine fibers of basalt, which is composed of the minerals plagioclase, pyroxene and olivine. |
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| The small clusters of coarse pyroxene and plagioclase are also found near contacts, including individual large rounded grains of augite. |
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| Plagioclase is partly altered to saussurite and sericite, and pyroxene is variably altered to pale brown and pale green actinolitic amphibole, chlorite, and epidote. |
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| The illustrated samples bearing cassiterite and yazganite minerals come from the edges of fissures in the porphyric pyroxene andesitic rocks at Senir Sirti. |
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| Scientists also found telltale chemical fingerprints of pyroxene and olivine in and around the crater, two minerals that are commonly present in the Martian meteorites. |
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| He thinks NWA 7325 could belong to a class of meteorites known as primitive achondrites, which contain chromium-rich pyroxene and are low in iron. |
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| The rock also has different levels of titanium and calcium than Mercury has, plus large amounts of a chromium-rich version of the mineral pyroxene. |
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| Garnet developed in calcareous rocks as well as amphibole and pyroxene. |
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