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Dolomite is a carbonate mineral composed of calcium magnesium carbonate CaMg(CO3)2.,br> The term is also used to describe the sedimentary carbonate rock dolostone. Dolostone (dolomite rock) is composed predominantly of the mineral dolomite with a stoichiometric ratio of 50% or greater content of magnesium replacing calcium, often as a result of diagenesis. (source: Wikipedia) The first piece below is from Saskatchewan, and is on display at the Mewbourne College of Earth & Energy first two photos by Michael Marcotte Lawrence County, Arkansas specimen, photo by Didier Descouens Wiki Commons public domain photo German specimen - photo by Didier Descouens Return to List Back to Michael's Hobbies page Back to Michael Marcotte's HomePage