Cobaltoan Calcite w/ Kolwezite (DR Congo) | cobalto calcite crystal, mineral specimenCobaltoan calcite, also known as cobalto calcite, is a pink to deep magenta variety of calcite colored by the substitution of cobalt ions in the calcite crystal structure. The Democratic Republic of the Congo is known for producing brilliantly colored, and lustrous crystals that are prized by collectors. This piece features Kolwezite, which is a rare, pale green copper cobalt carbonate hydroxide mineral often associated with deposits in the Katanga