Type of limestone, the carbonate fraction of which is dominated by the mineral dolomite, calcium magnesium carbonate CaMg(CO). The carbonate mineral dolomite occurs in marbles, talc schists, and other magnesium-rich metamorphic rocks. It occurs in hydrothermal veins, in cavities in carbonate rocks, and less often in various sedimentary rocks as a cement. It is most common as a rock-forming mineral in carbonate rocks.

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