Macro of stepped cubic growth structures on a silver carrollite crystal corner.
Close-up of metallic silver carrollite crystal faces with geometric step lines.
Metallic silver gray carrollite crystal with octahedral faces from Congo.

Carrollite

Carrollite – CuCo2S4
Elements: Copper, Cobalt, Sulfur
Class: Sulfides
Crystal System: Cubic
Hardness: 4.5-5.5
Apatite
Talc (1)Diamond (10)
About as hard as a steel knife blade.
Origin: Kamoto, Kolwezi Mining District, Lualaba – Congo (drc)
Did you know?

Behind its bright steel-like crystals, carrollite is a significant ore of cobalt, the same metal at the heart of the rechargeable batteries in phones and electric cars.

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