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Dacite

A type of light-colored volcanic rock, rich in silica (63-68%)

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Deposit

An accumulation of minerals or resources at one of various stages of measurement

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Diamond drill

A core drill utilizing as diamond tipped bit to interface and extract cored cross sections of various hard rock

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Diamond

The hardest naturally occurring mineral composed of densely packed carbon atoms

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Demineralization

Water softening through the removal of minerals by means including filtration through porous media and reverse osmosis