Calcite is a calcium carbonate mineral. The most common natural calcium carbonate is it. Therefore, calcite is a widely distributed mineral. Calcite crystals are of various shapes, and their aggregates can be clusters of crystals, or granular, massive, fibrous, stalactic, earthy, and so on. Knocking calcite can get many square pieces, hence calcite. Calcite is the main mineral of limestone and marble, and has many uses in production and life. We know that limestone can form karst caves, in which stalactite, stalagmite white jade and so on are actually composed of calcite. Calcite contains Mn, Fe, Zn, Mg, Pb, Sr, Ba, Co, TR and other isomorphic substitutes; when they reach a certain amount, they can form manganese calcite, iron calcite, zinc calcite, magnesium calcite and other varieties. In addition, brucite, dolomite, iron hydroxide and oxide, sulfide, quartz and other mechanical and technological mixtures are also common in the crystal.