👉 Chalcanthite is a mineral that belongs to the group of halite, an important rock-forming material in many parts of the world. It's composed mainly of calcite (calcium carbonate) and small amounts of other minerals such as dolomite (sulphates), mica (silicates), and quartz (crystals). Chalcanthite is typically found in rocks like marble, granite, or limestone. Chalcanthite has a distinctive appearance that can