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trachybasalt

[trey-kee-buh-sawlt, -bas-awlt, -bey-sawlt, trak-ee-]
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noun
  1. a fine-grained volcanic rock containing sanidine and calcic plagioclase.
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Origin of trachybasalt

First recorded in 1885–90; trachy- + basalt
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018