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 90ï¿½, 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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Fassaite :: Fassaite (n.) A variety of pyroxene, from the valley of Fassa, in the Tyrol..

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

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..

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

Pyroxenite :: Pyroxenite (n.) A rock consisting essentially of pyroxene.

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..

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

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

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

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..

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

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..

Mussite :: Mussite (n.) A variety of pyroxene, from the Mussa Alp in Piedmont; diopside..

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)..

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..

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

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..

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

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

Bronzite :: Bronzite (n.) A variety of enstatite, often having a bronzelike luster. It is a silicate of magnesia and iron, of the pyroxene family..