Gaines, Alan M. Division of Earth Science, National Science Foundation, Washington, DC.
Last reviewed:August 2020
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The carbonate mineral CaMg(CO3)2. Dolomite is a very common mineral, occurring in a variety of geologic settings. It is often found in ultrabasic igneous rocks, notably in carbonatites and serpentinites, in metamorphosed carbonate sediments, where it may recrystallize to form dolomite marbles (see illustration), and in hydrothermal veins. The primary occurrence of dolomite is in sedimentary deposits, where it constitutes the major component of dolomite rock and is often present in limestones. See also: Carbonate minerals; Dolomite rock; Limestone; Sedimentary rocks
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