The mineral dolomite is widely distributed in the Earth's crust, especially in sedimentary/diagenetic settings, in rocks that range in age from the Precambrian to the Recent. Ideal, ordered dolomite has a formula of CaMg (CO3)2 and consists of alternating layers of Ca2+-CO3 2−-Mg2+-CO3 2−-Ca2+ etc. perpendicular to the crystallographic c-axis. Most natural dolomite has up to a few percent Ca-surplus (and corresponding Mg-deficit), as well as less than ideal ordering. Protodolomite has about 55 percent to 60 percent Ca and is partly to completely disordered, that is, the alternating layer structure is poorly developed to non-existing. Protodolomite or partially ordered dolomite with a few percent Ca-surplus are common as metastable precursors of well-ordered, nearly stoichiometric dolomite. Dolostone is a rock that consist of >75 percent dolomite. Dolostones are alsocalled dolomites, especially in the literature prior to about 1990, but the term dolomites should be used only for...
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Machel, H.G. (1978). Dolomites and dolomitization. In: Middleton, G.V., Church, M.J., Coniglio, M., Hardie, L.A., Longstaffe, F.J. (eds) Encyclopedia of Sediments and Sedimentary Rocks. Encyclopedia of Earth Sciences Series. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-3609-5_72
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