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trachybasalt

 - 1 dictionary result

tra⋅chy⋅ba⋅salt

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

Origin:
1885–90; trachy- + basalt
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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