lapis lazuli
Lazurite is a framework silicate mineral containing sulfate ions, sulfur ions, and chloride ions. Its chemical formula is (Na, Ca) 8 [(S, Cl, SO4, OH) 2 | (Al6Si6O24)]. Belonging to the feldspar like mineral group of sodalite minerals, the crystal system is equiaxed, and intact crystal forms are extremely rare, mostly in the form of blocks. Most of them exist in Qingjin Rock in nature. The English word 'Lazrite' comes from the Persian word 'lazward', which means blue.
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