The color of calcium carbonate is typically white. This is due to its chemical composition and crystal structure. Calcium carbonate is a mineral that forms in a variety of geological environments and is the primary component of limestone, marble, and chalk. The white color is a result of the way light interacts with the crystal lattice of calcium carbonate. The crystals are transparent and have a high refractive index, which causes light to scatter and reflect back as white light. This is consistent with data from various scientific studies, which have consistently reported the color of calcium carbonate as white. For instance, a study by the U.S. Geological Survey (USGS) notes that calcium carbonate is generally white, with variations in color due to impurities or the presence of other minerals. Additionally, the color of calcium carbonate can be influenced by the specific form it takes, such as calcite or aragonite, but the basic color remains white.