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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..

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

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..

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

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

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

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..

Felspathic :: Felspathic (a.) See Feldspathic.

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