trachyte

tra•chyte n.

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.

Greek trāchýtēs roughness, equivalent. to trāchý(s) rough + -tēs noun, nominal suffix
French
1815–25;

tra•chyt•ic , trach•y•toid , adj.

Collins Concise English Dictionary © HarperCollins Publishers::

trachyte /ˈtreɪkaɪt; ˈtræ-/ n

a light-coloured fine-grained volcanic rock of rough texture consisting of feldspars with small amounts of pyroxene or amphibole

Etymology: 19th Century: from French, from Greek trakhutēs, from trakhus roughtrachytoid /ˈtrækɪˌtɔɪd; ˈtreɪ-/ adj

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