Manganite

N'Chwaning II Mine, N'Chwaning mining area, Kuruman, Kalahari manganese field (KMF), Northern Cape Province  South Africa (2002)

Specimen size: 4.6 × 3.9 × 2.5 cm = 1.81” × 1.54” × 0.98”
Main crystal size: 2.2 × 2.2 cm = 0.87” × 0.87”