Carrollite in calcite – Congo

This specimen combines several crystals of carrollite, a cobalt and copper sulfide known for its silvery metallic sheen, with a matrix of white calcite showing well-defined shapes. The carrollite crystals appear here as small, sharp polyhedra that contrast with the softer, satin-like surface of the calcite. This association offers a balanced ensemble, representative of what can be found in some historical localities of the Democratic Republic of Congo.

Carrollite forms in hydrothermal veins associated with the major copper deposits of the Congolese Copperbelt. It frequently crystallizes in shapes close to the octahedron, sometimes as small, bright polyhedra. The calcite acts here as the host matrix, providing a suitable environment for the growth of these metallic crystals.

Collection interest

• Typical carrollite–calcite association, useful for understanding the formation context.
• Texture contrast: metallic luster of the carrollite vs the pearly aspect of the calcite.
• Specimen from an old collection, often well preserved.

Care instructions

• Avoid prolonged humidity and saline environments; store away from strong fluctuations.
• Dust with a soft brush rather than a cloth to preserve the crystal faces.
• Do not use acidic products (as calcite reacts to acids, even mild ones) or ultrasonic cleaning.
• Handle with clean, dry hands to prevent marks on metallic surfaces.

Dimensions

Width: 31 mm  X  Height: 35 mm