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dark mineral

American  

noun

Geology.

  1. any rock-forming mineral that has a specific gravity greater than 2.8 and that is generally dark in color.

Example Sentences

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Hornblende is a dark mineral which contains considerable iron.

From Earth and Sky Every Child Should Know Easy studies of the earth and the stars for any time and place by Rogers, Julia Ellen

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.