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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

Pyroligneous :: Pyroligneous (a.) Alt. of Pyroligni.

Ligneous :: Ligneous (a.) Made of wood; consisting of wood; of the nature of, or resembling, wood; woody..

Ditroite :: Ditroite (n.) An igneous rock composed of orthoclase, elaeolite, and sodalite..

Anorthite :: Anorthite (n.) A mineral of the feldspar family, commonly occurring in small glassy crystals, also a constituent of some igneous rocks. It is a lime feldspar. See Feldspar..

Greenstone :: Greenstone (n.) A name formerly applied rather loosely to certain dark-colored igneous rocks, including diorite, diabase, etc..

Eruptive :: Eruptive (a.) Produced by eruption; as, eruptive rocks, such as the igneous or volcanic..

Dike :: Dike (n.) A wall-like mass of mineral matter, usually an intrusion of igneous rocks, filling up rents or fissures in the original strata..

Pyrolignous :: Pyrolignous (a.) Same as Pyroligneous.

Tephrite :: Tephrite (n.) An igneous rock consisting essentially of plagioclase and either leucite or nephelite, or both..

Volcanist :: Volcanist (n.) One who believes in the igneous, as opposed to the aqueous, origin of the rocks of the earth's crust; a vulcanist. Cf. Neptunist..

Semiligneous :: Semiligneous (a.) Half or partially ligneous, as a stem partly woody and partly herbaceous..

Picrite :: Picrite (n.) A dark green igneous rock, consisting largely of chrysolite, with hornblende, augite, biotite, etc..

Toadstone :: Toadstone (n.) A local name for the igneous rocks of Derbyshire, England; -- said by some to be derived from the German todter stein, meaning dead stone, that is, stone which contains no ores..

Plutonist :: Plutonist (n.) One who adopts the geological theory of igneous fusion; a Plutonian. See Plutonism.

Stamina :: Stamina (n. pl.) The fixed, firm part of a body, which supports it or gives it strength and solidity; as, the bones are the stamina of animal bodies; the ligneous parts of trees are the stamina which constitute their strength..

Pyrogenous :: Pyrogenous (a.) Produced by fire; igneous.

Igneous :: Igneous (a.) Resulting from, or produced by, the action of fire; as, lavas and basalt are igneous rocks..

Igneous :: Igneous (a.) Pertaining to, having the nature of, fire; containing fire; resembling fire; as, an igneous appearance..

Lignify :: Lignify (v. t.) To convert into wood or into a ligneous substance.

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