2.1" Dioptase Crystals on Quartz - Kimbedi, Congo

These are gemmy dioptase crystals on a quartz encrusted matrix, collected from the Kimbedi area of the Republic of the Congo. The entire specimen is 2.1" long and the crystals are a lustrous, deep emerald-green color. Some of the quartz crystals have dioptase crystal inclusions.

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 it's vibrant color and it is occasionally cut into small emerald-like gems.

Silicon Dioxide, also known as SiO2 or Quartz, is the second most abundant mineral in the Earth's crust. Quartz crystals generally grow in silica-rich, hot watery solutions called hydrothermal environments, at temperatures between 100°C and 450°C, and usually under very high pressure. Quartz veins are formed when open fissures are filled with hot water during the closing stages of mountains forming, and can be hundreds of millions of years old.

Dioptase & Quartz
Kimbedi area, Mindouli District, Pool Department, Republic of the Congo
2.1 x 1.4"