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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Coccolite :: Coccolite (n.) A granular variety of pyroxene, green or white in color..

Pyroxenic :: Pyroxenic (a.) Containing pyroxene; composed chiefly of pyroxene.

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

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..

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..

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

Fassaite :: Fassaite (n.) A variety of pyroxene, from the valley of Fassa, in the Tyrol..

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

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..

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..

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

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..

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

Jeffersonite :: Jeffersonite (n.) A variety of pyroxene of olive-green color passing into brown. It contains zinc.

Uralite :: Uralite (n.) Amphibole resulting from the alternation of pyroxene by paramorphism. It is not uncommon in massive eruptive rocks.

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

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..

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..

Malacolite :: Malacolite (n.) A variety of pyroxene.

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..