Calcite

Calcite is a common mineral made of calcium carbonate, often found in sedimentary rocks like limestone and marble. It usually appears as clear or white crystals but can come in various colors due to impurities. Calcite is important in nature, playing a key role in the carbon cycle and the formation of soil. It’s also used in industries for making cement, glass, and chalk. Notably, calcite reacts with acids, which can help distinguish it from other minerals. Its unique optical properties make it valuable in optics and scientific instruments as well.