Rare Jewel-like Dioptase
Mindouli, Pool Department, Republic of Congo (Brazzaville)
This is a rare form of dioptase of botryoidal form, most likely a cast over another mineral, entirely covered with jewel-like crystals of vivid emerald green color. This is a mineralogically and aesthetically important specimen. Measuring 4 1/4 x 3 1/2 x 1in