CaCO3 is the chemical formula for the mineral calcite, which is found in rocks. It is common and may be found in igneous, metamorphic, and sedimentary rocks all over the world. It is referred to be a “ubiquitous mineral” by certain geologists since it can be found everywhere. The most prevalent kind of calcium carbonate is calcite, which is renowned for its many and exquisite crystals. Scalenohedral calcite is a common occurrence, and it can also twin often into heart- or butterfly-shaped crystals. Although the calcite crystals often have rhombohedral terminations, there are also shallow rhombohedral terminations, also referred to as nailhead spar.