English definition of Pyroxene

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Definition of pyroxene

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Pyroxene (n.) A common mineral occurring in monoclinic crystals, with a prismatic angle of nearly 90¡, and also in massive forms which are often laminated. It varies in color from white to dark green and black, and includes many varieties differing in color and composition, as diopside, malacolite, salite, coccolite, augite, etc. They are all silicates of lime and magnesia with sometimes alumina and iron. Pyroxene is an essential constituent of many rocks, especially basic igneous rocks, as basa

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Diabase :: Diabase (n.) A basic, dark-colored, holocrystalline, igneous rock, consisting essentially of a triclinic feldspar and pyroxene with magnetic iron; -- often limited to rocks pretertiary in age. It includes part of what was early called greenstone..

Ophite :: Ophite (n.) A greenish spotted porphyry, being a diabase whose pyroxene has been altered to uralite; -- first found in the Pyreness. So called from the colored spots which give it a mottled appearance..

Augite :: Augite (n.) A variety of pyroxene, usually of a black or dark green color, occurring in igneous rocks, such as basalt; -- also used instead of the general term pyroxene..

Pyrgom :: Pyrgom (n.) A variety of pyroxene; -- called also fassaite.

Diallage :: Diallage (n.) A dark green or bronze-colored laminated variety of pyroxene, common in certain igneous rocks..

Dolerite :: Dolerite (n.) A dark-colored, basic, igneous rock, composed essentially of pyroxene and a triclinic feldspar with magnetic iron. By many authors it is considered equivalent to a coarse-grained basalt..

Aphanite :: Aphanite (n.) A very compact, dark-colored /ock, consisting of hornblende, or pyroxene, and feldspar, but neither of them in perceptible grains..

Salite :: Salite (n.) A massive lamellar variety of pyroxene, of a dingy green color..

Gabbro :: Gabbro (n.) A name originally given by the Italians to a kind of serpentine, later to the rock called euphotide, and now generally used for a coarsely crystalline, igneous rock consisting of lamellar pyroxene (diallage) and labradorite, with sometimes chrysolite (olivine gabbro)..

Lherzolite :: Lherzolite (n.) An igneous rock consisting largely of chrysolite, with pyroxene and picotite (a variety of spinel containing chromium)..

Peridotite :: Peridotite (n.) An eruptive rock characterized by the presence of chrysolite (peridot). It also usually contains pyroxene, enstatite, chromite, etc. It is often altered to serpentine..

Syenitic :: Syenite (n.) A granular, crystalline, ingeous rock composed of orthoclase and hornblende, the latter often replaced or accompanied by pyroxene or mica. Syenite sometimes contains nephelite (elaeolite) or leucite, and is then called nephelite (elaeolite) syenite or leucite syenite..

Diopside :: Diopside (n.) A crystallized variety of pyroxene, of a clear, grayish green color; mussite..

Asbestos :: Asbestos (n.) A variety of amphibole or of pyroxene, occurring in long and delicate fibers, or in fibrous masses or seams, usually of a white, gray, or green-gray color. The name is also given to a similar variety of serpentine..

Babingtonite :: Babingtonite (n.) A mineral occurring in triclinic crystals approaching pyroxene in angle, and of a greenish black color. It is a silicate of iron, manganese, and lime..

Andesite :: Andesite (n.) An eruptive rock allied to trachyte, consisting essentially of a triclinic feldspar, with pyroxene, hornblende, or hypersthene..

Uralitization :: Uralitization (n.) The change of pyroxene to amphibole by paramorphism.

Rensselaerite :: Rensselaerite (n.) A soft, compact variety of talc,, being an altered pyroxene. It is often worked in a lathe into inkstands and other articles..

Hypersthene :: Hypersthene (n.) An orthorhombic mineral of the pyroxene group, of a grayish or greenish black color, often with a peculiar bronzelike luster (schiller) on the cleavage surface..

Pyroxene :: Pyroxene (n.) A common mineral occurring in monoclinic crystals, with a prismatic angle of nearly 90¡, and also in massive forms which are often laminated. It varies in color from white to dark green and black, and includes many varieties differing in color and composition, as diopside, malacolite, salite, coccolite, augite, etc. They are all silicates of lime and magnesia with sometimes alumina and iron. Pyroxene is an essential constituent of many rocks, especially basic igneous rocks, as basa