epidiorite

[ ep-i-dahy-uh-rahyt ]

noun

, Petrography.

1. a schistose metamorphic rock resulting from the alteration of augite to hornblende in a gabbro or dolerite.

Word History and Origins

Origin of epidiorite¹

First recorded in 1885–90; epi- + diorite

Example Sentences

The metamorphic rocks are associated with bands of epidiorite which have shared in the folding and metamorphism of the region.

From Project Gutenberg