microdiorite

Meaning

1. noun A course-grained igneous rock, of volcanic origin, containing mostly plagioclase feldspar; a rock whose composition is intermediate between andesite and diorite.

Similar words

diorite granodiorite syenodiorite microdolerite quartz-diorite microgabbro diabase diasporite leucodiorite monzodiorite

Often followed by

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