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DIOPTASE$400.00
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Dioptase, a copper silicate species, is generally very rare in secondary copper deposits worldwide, but there are a number of exceptions, where it crystallizes as very well-formed glassy emerald-green crystals. Its Type Locality at Altyn-Tube in Kazakhstan is one such case, but there are several well-known deposits in Africa too, of which the famous Tsumeb mine is the best-known. In the Republic of Congo (Brazzaville), near Renéville incredibly rich, pure veins and nodules of Dioptase are lined with very well-crystallized glassy emerald-green Dioptase crystals. Generally speaking, the Dioptase crystals from Renéville are not quite as gemmy as those from Tsumeb, but for sheer wow-factor the richness of Renéville specimens is hard to beat. At 15 cm in length this is a really dramatic large display specimen and represents a lot of Dioptase for the price, with individual crystals reaching 7 mm in length and showing the classic rhombic prism form. The back of this plate of Dioptase is a complex series of hollow casts after an unknown mineral with massive to botryoidal pale blue Chrysocolla coating the inside of the casts. Ex Kessler Collection.
Product details
Species
SizeLarge Cabinet
Dimensions15.7 x 8.2 x 4.5 cm
Locality
Renéville, Kindanba District, Pool Department, Republic of Congo (Brazzaville)
SKUCC55908
Listed on12/13/2025
Known provenance
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