The Probert Encyclopaedia of Rocks & Minerals

TRACHYTE

Trachyte is a group of igneous volcanic rocks, grey, yellow, brown, green and red in colour consisting chiefly of alkali feldspar, and often containing crystals of glassy feldspar, mica, hornblende, or augite. Trachyte occurs in lava, intrusive sheets, and dykes from the early Tertiary period. It is sometimes used as a paving material.
Research Trachyte