Rhodochrocite

Rhodochrosite is a manganese mineral related to calcite. Argentina is probably the largest producer of Rhodochrosite used for gemstone. The Rhodochrocite in Argentina is a rare form found in large amounts in caves much the same as ordinary calcite cave onyx. Large amounts of stalactite like  Rhodochrosite growths, consisting of bright pink bands, are great for carving and gemstones.