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Manganoan calcite
From Wikipedia, the free encyclopedia
Manganoan calcite or manganocalcite is a variety of calcite rich in manganese, which gives the mineral a pink color.[1] Its chemical formula is (Ca,Mn)CO3. It was first reported from the Banská Štiavnica Mining District, Slovak Republic,[1] but is widely distributed around the world, notably in the Cave of Swords at Naica, Chihuahua, Mexico as well as in Bulgaria.
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Manganoan calcite is sometimes confused with rhodochrosite. The amount of manganese in manganoan calcite varies at different localities, and the mineral forms a solid solution series between calcite and rhodochrosite, with the color becoming redder with a higher proportion of manganese.