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Magnesite, is magnesium carbonate, MgCO3. Iron (as Fe2+) substitutes for magnesium (Mg) with a complete solution series with siderite, FeCO3. Calcium, manganese, cobalt, and nickel may also occur in small amounts. Dolomite, (Mg,Ca)CO3, is almost indistinguishable from magnesite. (source: Wikipedia) public domain shared photo by Didier Descouens photo by Michael Marcotte Return to List Back to Michael's Hobbies page Back to Michael Marcotte's HomePage