The chemical composition of the azurite is Cu3[CO3]2(OH)2, and the crystal belongs to the monoclinic carbonate mineral. In ancient China, it was called Shi Qing. The crystal is in the form of a column or a thick plate, and is usually in the form of a granule, a stalactite, a hull, or a soil. Dark blue, glass luster, earthy block is light blue, dull gloss. The cleavage is complete or medium, with a shell-like fracture. The Moss hardness is 3.5 to 4, and the specific gravity is 3.7 to 3.9. It is closely symbiotic with malachite and is produced in the oxidation zone of copper deposits. It is a secondary production of copper sulfide oxidation. The azurite is easily converted into malachite, so the distribution of the azurite is not as extensive as malachite. It can be used as copper ore in large quantities; it can be used to make handicraft materials in pure color; powder is used to make natural blue pigments. In addition, it can also be used as a sign to find the original copper mine.
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