monomineral rock

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• gabbro — gabbroic /geuh broh ik/, gabbroitic, adj. gabbroid /gab royd/, adj. /gab roh/, n., pl. gabbros. Petrol. a dark granular igneous rock composed essentially of labradorite and augite. [ < It; akin to L glaber smooth] * * * Any of several medium or… …   Universalium