Trachyte :: Trachyte (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..

Trachytic :: Trachytic (a.) Of, pertaining to, or resembling, trachyte..

Trachytoid :: Trachytoid (a.) Resembling trachyte; -- used to define the structure of certain rocks.

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