Olmiite with Calcite

N'Chwaning II Mine, N'Chwaning mining area, Kuruman, Kalahari manganese field (KMF), Northern Cape Province  South Africa (11/2003)

Specimen size: 8.2 × 6.3 × 2.2 cm = 3.23” × 2.48” × 0.87”
Main crystal size: 1.7 × 1.2 cm = 0.67” × 0.47”