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trachyte 粗面巖 粗面岩 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. [1913 Webster]
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