Any dense, hard, dark, igneous rock, including diorite, basalt, and feldspar; named for its propensity to trap crystalline minerals in voids within the rock. (Bucher, 1996)
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Any dense, hard, dark, igneous rock, including diorite, basalt, and feldspar; named for its propensity to trap crystalline minerals in voids within the rock. (Bucher, 1996)
« Back to Glossary Index