Dioptase

'Mbumba, Pimbi hill, Mindouli, Mindouli District, Pool Department  Congo D.R. (2011)

Specimen size: 4.5 × 3.6 × 2.9 cm = 1.8” × 1.4” × 1.1”
Main crystal size: 2.5 × 1.2 cm = 1.0” × 0.5”