Phosphorus is widely distributed in nature. It does not occur in free state since it can be very easily oxidised. It is usually present in rocks in the combined state as phosphates. The main phosphate rocks are:
Phosphorite: Ca3(PO4)2
Fluorapatite: 3Ca3(PO4)2 . CaF2Chlorapatite: 3Ca3(PO4)2 . CaCl2
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