Dioptase

'Mbumba, Pimbi Hill, Mindouli, Mindouli District, Pool Department  Republic of the Congo

Specimen size: 2.2 × 1.4 × 1.5 cm = 0.87” × 0.55” × 0.59”
Main crystal size: 1.4 × 0.5 cm = 0.55” × 0.20”