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: 3.4 × 2.3 × 3.8 cm = 1.34” × 0.91” × 1.50”