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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.
About Rhodonite - History and Introduction. Rhodonite is a rose pink to dark red gemstone with black dendritic inclusions. It is a manganese silicate, and a member of the pyroxenoid group of minerals. The manganese is often partly replaced by iron, magnesium, calcium, and sometimes zinc, occasionally in large quantities.