Mangano calcite is a beautiful pink (and often banded) version of calcite that also goes by the names of ?pink mangano calcite,? ?pink magnesium calcite,? and ?the reiki stone.? It belongs to the carbonates mineral class and exhibits a trigonal crystal system and a hardness of 2.5 to 3 on the Mohs scale.??Manganoan calcite is sometimes confused with rhodochrosite. The amount of manganese in manganocalcite 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.