Olmiite with Calcite

N'Chwaning II Mine, upper levels, N'Chwaning mining area, Kuruman, Kalahari manganese field (KMF), Northern Cape Province  South Africa (12/2008)

Specimen size: 9.4 × 6.4 × 5.3 cm = 3.70” × 2.52” × 2.09”