dark mineral

dark mineral

noun Geology.
any rock-forming mineral that has a specific gravity greater than 2.8 and that is generally dark in color.
Compare light mineral.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Dark mineral is always a great word to know.
So is percolation. Does it mean:
slow movement of water through the pores in soil or permeable rock
single bed of sedimentary rock, consisting of one kind of matter representing continuous deposition
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