Rhodochrosite carbonate manganese mineral
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 and 4. Its specific gravity is between and It crystallizes in the trigonal system, and cleaves with rhombohedral carbonate cleavage in three directions. Crystal twinning often is present. It is transparent to translucent with refractive indices of nω= to , nε= to It is often confused with the manganese silicate, rhodonite, but is distinctly softer.
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Keywords: carbonate, crystal, geology, macro, macrophotography, manganese, mineral, red, rhodochrosite
