Dioptase

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

Specimen size: 2.3 × 1.7 × 0.8 cm = 0.91” × 0.67” × 0.31”
Main crystal size: 0.5 × 0.2 cm = 0.20” × 0.08”