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Trigonal-rhombohedral structure is how the mineral Dolomit crystallises. Crystals made of it might be white, tan, grey, or pink. With an alternate structural arrangement of calcium and magnesium ions, Dolomit is a double carbonate. It does not quickly dissolve or effervesce (fizz) in cold, diluted hydrochloric acid like calcite does, unless it is in fine powder form. Twin crystals are quite common.
Between Dolomite, the manganese- and iron-dominant kutnohorite, and the iron-dominant ankerite, there is a solid solution. Crystals with little levels of iron in their structure have a yellow to brown hue. Up to 3% MnO replacements for manganese are also present in the structure. The pink tint of the crystals is a result of their high manganese concentration. Lead, zinc, and cobalt are also used in the construction to substitute magnesium. Dolomit is a similarly related mineral.
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