English definition of Feldspath

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Definition of feldspath

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Feldspath (n.) A name given to a group of minerals, closely related in crystalline form, and all silicates of alumina with either potash, soda, lime, or, in one case, baryta. They occur in crystals and crystalline masses, vitreous in luster, and breaking rather easily in two directions at right angles to each other, or nearly so. The colors are usually white or nearly white, flesh-red, bluish, or greenish..

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Feldspath :: Feldspath (n.) A name given to a group of minerals, closely related in crystalline form, and all silicates of alumina with either potash, soda, lime, or, in one case, baryta. They occur in crystals and crystalline masses, vitreous in luster, and breaking rather easily in two directions at right angles to each other, or nearly so. The colors are usually white or nearly white, flesh-red, bluish, or greenish..

Felspathic :: Felspathic (a.) See Feldspathic.

Euritte :: Euritte (n.) A compact feldspathic rock; felsite. See Felsite.

Porphyry :: Porphyry (n.) A term used somewhat loosely to designate a rock consisting of a fine-grained base (usually feldspathic) through which crystals, as of feldspar or quartz, are disseminated. There are red, purple, and green varieties, which are highly esteemed as marbles..

Trap :: Trap (n.) An old term rather loosely used to designate various dark-colored, heavy igneous rocks, including especially the feldspathic-augitic rocks, basalt, dolerite, amygdaloid, etc., but including also some kinds of diorite. Called also trap rock..

Elvan :: Elvan (a.) Of or pertaining to certain veins of feldspathic or porphyritic rock crossing metalliferous veins in the mining districts of Cornwall; as, an elvan course..

Feldspathose :: Feldspathose (a.) Pertaining to, or consisting of, feldspar..

Feldspathic :: Feldspathic (a.) Alt. of Feldspathos.

Clinkstone :: Clinkstone (n.) An igneous rock of feldspathic composition, lamellar in structure, and clinking under the hammer. See Phonolite..

Phonolite :: Phonolite (n.) A compact, feldspathic, igneous rock containing nephelite, hauynite, etc. Thin slabs give a ringing sound when struck; -- called also clinkstone..