Hausmannite

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

Specimen size: 3.1 × 2.7 × 2.1 cm = 1.22” × 1.06” × 0.83”
Main crystal size: 1.4 × 1.1 cm = 0.55” × 0.43”