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trachybasalt

American  
[trey-kee-buh-sawlt, -bas-awlt, -bey-sawlt, trak-ee-] / ˌtreɪ ki bəˈsɔlt, -ˈbæs ɔlt, -ˈbeɪ sɔlt, ˌtræk i- /

noun

  1. a fine-grained volcanic rock containing sanidine and calcic plagioclase.


Etymology

Origin of trachybasalt

First recorded in 1885–90; trachy- + basalt

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