This rhodochrosite is from the Wessels Mine, Hotazel in the Kalahari manganese fields of the Northern Cape Province of South Africa. The manganese fields contain the largest deposits of manganese on earth. They also contains over one 100 different associated mineral species including rhodochrosite. It is a carbonate that contains the elements Mn, C and O. This specimen consists of a breccia matrix with an exposed pocket containing dozens of rhodochrosite crystals and minor, tabular, hematites. Some of the rhodochrosite crystals have black, fiber-like, crystal inclusions of an unidentified mineral. This piece measures 1 3/4 x 1 1/4 x 1 1/8 inches or 44 x 32 x 28 mm.