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apatite
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apatite

Common calcium phosphate mineral, Ca5(PO4)3(F,OH,Cl). Apatite has a hexagonal structure and occurs widely in igneous rocks, such as pegmatite, and in contact metamorphic rocks, such as marbles. It is used in the manufacture of fertilizer and as a source of phosphorus. Carbonate hydroxylapatite, Ca5(PO4,CO3)3(OH)2, is the chief constituent of tooth enamel and, together with other related phosphate minerals, is the inorganic constituent of bone. Apatite ranks 5 on the Mohs scale of hardness.



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