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Dolomite rocks (or Dolostone) are those which contain more than 50% carbonate minerals of which over half are dolomite minerals (calcium-magnesium carbonate). Because many dolomites appear to form by replacement of limestone, the rocks are usually crystalline. Although dolomite may be slightly soluble in water, karst will form in dolomite areas as the minerals react chemically with dissolved carbon dioxide and organic acids. Although calcite and dolomite are usually the most abundant minerals, other common minerals include aragonite and magnesite (magnesium carbonate). Impurities, which tend to inhibit or slow down karstification, include chert, flint, authigenic (formed in place) quartz and feldspar, and clay minerals. Dolomite is considered carbonate rock.
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