Hypertext Webster Gateway: "trachyte"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Trachyte \Tra"chyte\, n. [Gr. ? rough, rugged: cg. F. trachyte.]
(Geol.)
An igneous rock, usually light gray in color and breaking
with a rough surface. It consists chiefly of orthoclase
feldspar with sometimes hornblende and mica.
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