Dioptase from Renéville, Pool Department, Republic of the Congo

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Brilliant green lustrous crystals of dioptase measuring to 0.7 cm in size on matrix. Prominent crystals are all in good condition, minor damage present along the lower edges, especially on the backside, near the matrix. Quite attractive with great color and luster. The specimen comes with a previous label from the collection of Ray DeMark. The mines around Reneville, located in the Pool Department of the Republic of the Congo within the Niari Basin, is historically renowned for its rich polymetallic mineral deposits. Geologically, the area consists of sedimentary rock formations where intensive supergene oxidation processes have yielded exceptional secondary copper mineralization, most notably world-class crystal specimens of dioptase and malachite. Historically, the deposits of this region were worked by local African communities for centuries before European contact, serving as a vital medium for regional trade. During the late 19th and early 20th centuries, French colonial prospectors initiated formal industrial extraction, targeting the high-grade copper carbonates that characterize the district.