The chemical composition is Ca[CO3], and the crystal belongs to a trigonal carbonate mineral. The crystal is often a complex three-sided triangular facet or a rhombohedron and a hexahedron. The aggregates are mostly granular, massive, stalactite, braided, fibrous, and clustered. Usually colorless, milky white, containing impurities, dyed into a variety of colors, sometimes with a faint color, in which the colorless transparent crystal is called ice stone, glass luster. Mohs hardness 3, specific gravity 2.6-2.9, three sets of complete rhombohedron cleavage, hence the name calcite, brittle. In case of cold dilute hydrochloric acid, it foams vigorously and releases CO2. Identification characteristics: the rhombohedron is completely cleavage, the hardness is not large, and the diluted hydrochloric acid is vigorously foamed. Calcite is one of the most widely distributed minerals and is the main constituent of limestone and marble. In the limestone area, the calcium bicarbonate dissolved in the solution precipitates calcite under suitable conditions, forming a natural landscape such as stalactites, stalagmites, sarcophagi and stone pillars. Calcite is used as a flux in the metallurgical industry and used in the construction industry to produce cement and lime. Ice Island Stone is a high-grade material for making polarizing prisms. Sterling Silver Brooch,Butterfly Brooch Pin,Vintage Silver Brooch,925 Sterling Silver Pins Brooches Golden Forest Jewelry Limited , https://www.golden-forest.com