4.3" Gemmy Dioptase Crystal Cluster on Quartz - Sanda Mine, Congo

This is a stunning cluster of gemmy dioptase crystals on a quartz crystal encrusted matrix, collected from the Sanda Mine (Sanda Hills occurrences) of the Republic of the Congo. The entire specimen is 4.3" wide and the dioptase is a lustrous, emerald-green color with wonderful translucency. Veins of sky-blue shattuckite can be seen at along the top of the matrix, making for an exceptionally colorful specimen.

The base of the rock has been cut flat for presentation.

Dioptase is an uncommon mineral found mostly in desert regions where it forms as a secondary mineral in the oxidized zone of copper sulfide mineral deposits. This copper based mineral forms small rhombohedral crystals, typically less than 0.75 cm in length.
It is popular with mineral collectors due to its vibrant color and it is occasionally cut into small emerald-like gems.

Dioptase, Shattuckite & Quartz
Sanda Hills Occurrences, Mindouli District, Pool Department, Republic of the Congo
4.3 x 3.6 x 2.6"