The distinctive pink coloured crystals in cobaltoan calcite are caused by impurities of cobalt. Both of these minerals come from the Democratic Republic of Congo (formerly Zaire). We purchased them locally from one of our suppliers in Cape Town.
Cobalt has recently become one of the most economically important metals in the world. It's a vital component for the production of lithium ion batteries which are rechargeable batteries used in electronic equipment and various applications.
This natural mineral which can feature exceptionally pink gemmy crystals was first discovered in the Calamita mine in Tuscany. Although most of the world's material now comes from Congo, it can be found in a several locations around the world.
The crystals on the cobaltoan calcite mineral on the right in our photos sparkle incessantly as they reflect light. They're also a deeper and richer shade of pink. A higher concentration of cobalt is responsible for the intensity of the colour.