Manganoan Calcite

Manganoan calcite also referred to as Mangano calcite is a pink variety of the mineral calcite. Geologically, it's a calcium carbonate belonging to the hexagonal crystal system. It's commonly found in marble and limestone formations and it's quite soft, with a Mohs hardness of 3. It also fizzes when it's exposed to acid.

Mangano calcite contains Rhodochrosite where some calcium ions are substituted by managanese within the calcites atomic structure. This gives it it's pale pink tinge. The manganese in the rhodochrosite also makes this calcite glow fluorescent orangey red under UV light.