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light mineral

noun, Geology.
any rock-forming mineral that has a specific gravity of less than 2.8 and is generally light in color.
Compare dark mineral. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Historical Examples
  • The light mineral is finely granulated and the whole is marked by uneven extinction.

    The Long Labrador Trail Dillon Wallace

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