trachyte


tra·chyte

noun \ˈtra-ˌkīt, ˈtrā-\

Definition of TRACHYTE

:  a usually light-colored volcanic rock consisting chiefly of potash feldspar

Origin of TRACHYTE

French, from Greek trachys rough
First Known Use: 1821

trachyte

noun    (Concise Encyclopedia)

Light-coloured, very fine-grained igneous rock composed chiefly of alkali feldspar with only minor mafic minerals (biotite, hornblende, or pyroxene). Trachyte is commonly found in volcanic regions; like many volcanic rocks, it shows a streaked or banded structure due to flowing of the congealing lava.

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