Rhodochrosite
Rhodochrosite is a manganese carbonate mineral of the Calcite group. It occurs mainly as massive aggregates or in granular, botryoidal, nodular or stalactitic forms, though rare, transparent rhombohedral and scalenohedral crystals are found. Rhodochrosite forms in hydro thermal veins of copper, lead and silver mines, and as secondary deposits in sedimentary layers of manganese oxide. […]