The History, Significance, Symbolism, Advantages, and Healing Properties of Cobalt Calcite Cobalt calcite, sometimes called cobaltocalcite or cobaltoan calcite, is a semi-precious stone that is a member of the calcite mineral group. Its pink to peach tones make it a favorite among gemstone jewelry fans worldwide. These hues set this stone apart from other calcite crystals. The cobalt content of the carbonate mineral is what gives it its pink hue. This stone is utilized not only to make jewelry but also to make different alloys, magnets, rechargeable batteries, and even nuclear fission reactors.