N'Chwaning II Mine, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa
(Mn3+,Fe3+)2O3
This is quite a large specimen for this rare species dwarving the more common specimens from Utah. It is composed of multiple cubic crystals on a massive base. The faces of the crystals have a high luster, many of which are striated. The specimen is in fairly good condition but there is some chipping and wear which is evident in the photos.