2.5" Polished Cobaltoan Calcite Sphere - Congo

This is a hand-polished sphere of pink cobaltoan calcite from the Congo. The lapidary work allows for the vivid coloration of the cobaltocalcite to be easily seen. As well as small amounts of natural green malachite and native copper, associated with the calcite. Unfortunately the variety of mineralizations within the rock made it difficult to polish into a perfect sphere, leaving the specimen with a somewhat wonky appearance.

Cobaltoan calcite, also known as cobaltocalcite is one of many different varieties of calcite, forming with a chemical composition of (Ca,Co)CO3. It crystallizes in a trigonal crystal system, and it forms rhombohedral or scalenohedral crystals. These crystals tend to display a pink color of which intensity can range anywhere from a pinkish-salmon to a hot pink.
Calcite var. Cobaltoan, Copper & Malachite
Katanga Province, Congo
2.5" wide