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Rhodochrosite is a manganese carbonate mineral with chemical composition MnCO3. In its (rare) pure form, it is typically a rose-red color, but impure specimens can be shades of pink to pale brown. It streaks white, and its Mohs hardness varies between 3.5 and 4. Its specific gravity is between 3.5 and 3.7.
It is also mined in the USA, South Africa, Russia, Peru and Uruguay. Rhodochrosite. In 2002 the State of Colorado officially named rhodochrosite as its state mineral since quite impressive specimens have been found in the Sweet Home Mine near Alma, Colorado. While rodochrosite is found all over the world, large red crystals are found only in a few places.