Auction Win: Cobalt-bearing “Cobalto” Calcite
Pickup available at Crystal Castle
Usually ready in 24 hours
Details
Locality: Katanga Copper Crescent, Haut-Katanga, DR Congo
Size: Miniature - 3.5 × 1.7 × 3.2 cm
The small black botryoidal crystals across the pink surface are currently a mystery to us. Cobalt-bearing “Cobalto” Calcite is a calcite variety in which cobalt substitutes for calcium, with formula (Ca,Co)CO3. Its cobalt content commonly produces light to dark pink coloration. The name describes its composition rather than identifying a separate mineral species.
The Katanga Copper Crescent is a major mining area in Haut-Katanga, DR Congo, renowned for sediment-hosted copper-cobalt deposits and exceptionally rich secondary copper minerals, especially malachite. Its mines have produced notable dioptase, cobaltian calcite, plancheite, and superb baryte crystal clusters, with Shangulowé particularly celebrated for some of the finest baryte specimens from the Congo. Famous localities such as Tantara, Ruashi, Luiswishi, and Kambove add depth to the region’s mineralogical importance, making Katanga specimens enduringly sought after by collectors.
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