Cobaltoan Calcite from Congo
The distinctive pink coloured crystals in cobaltoan calcite come from impurities of cobalt. These pieces come from the Democratic Republic of Congo.
Cobalt has recently become one of the world's most economically important metals. It's a vital component for the production of lithium-ion batteries, which are rechargeable batteries used in electronic equipment and various applications.
Cobaltoan calcite, which can feature exceptionally pink gemmy crystals, was first discovered in the Calamita mine in Tuscany. Although most material now comes from Congo, it can also be found in several other countries.
The crystals on the cobaltoan calcite 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.
In the piece on the left, minute sparkling crystals can also be seen in the rock matrix.
Bloodstone
