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1. (n.) trachyte
a fine-grained volcanic rock consisting essentially of alkali feldspar and one or more subordinate minerals, as hornblende or mica: the extrusive equivalent of syenite.
Etymology: (1815–25; < F < Gk trāchýtēs roughness =trāchý(s) rough +-tēs n. suffix)
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1. (noun) trachyte
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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Definitions of trachyte 
