Dolomite (variety cobaltoan) with Heterogenite

Mashamba West Mine, Kolwezi District, Lualaba, Katanga Copper Crescent, Katanga (Shaba)  Congo D.R.

Specimen size: 10.6 × 6.2 × 2.2 cm = 4.17” × 2.44” × 0.87”
Main crystal size: 1.1 × 0.5 cm = 0.43” × 0.20”