Trachyte

[treikait]

Definition

(n.) 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.

Inputed by Erma

Definition

n. a crystalline igneous rock generally grayish in colour usually fine-grained or compact more or less markedly porphyritic with large crystals of sanidine and scales of black mica.—adjs. Trachyt′ic; Trach′ytoid.

Editor: Timmy