Rare! Carrollite on Calcite | raw natural crystal cluster, metallic mineral specimenCarrollite on Calcite from the Democratic Republic of Congo is a rare and visually striking mineral combination. Carrollite forms metallic, steel gray to silvery cubic crystals, sitting atop contrasting white or translucent calcite. Sourced from the cobalt and copper rich mines of the DRC, these specimens highlight the natural crystallization of carrollite in sulfide rich hydrothermal veins. The combination of lustrous metallic carrollite and the