trachyte

noun
tra·​chyte | \ˈtra-ˌkīt, ˈtrā-\

Definition of trachyte 

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

First Known Use of trachyte

1821, in the meaning defined above

History and Etymology for trachyte

French, from Greek trachys rough

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The first known use of trachyte was in 1821

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