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dark mineral

noun, Geology
1.
any rock-forming mineral that has a specific gravity greater than 2.8 and that is generally dark in color.
Compare light mineral.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for dark mineral
  • Notice that this stone is made up of a mixture of light and dark mineral grains.

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Word Value for dark

9
9
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