Olmiite

N'Chwaning II Mine, 45 level, Kuruman, Kalahari manganese fields, Northern Cape  South Africa (10/2008)

Specimen size: 9.2 × 5.8 × 3 cm = 3.62” × 2.28” × 1.18”
Main crystal size: 2.8 × 2.1 cm = 1.10” × 0.83”