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trachybasalt

[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.
Origin
1885-1890
1885-90; trachy- + basalt
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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