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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Sajan sarthak Best Answer
A group of calcium phosphates. Fluorapatite: Ca5(PO4)3F Hydroxylapatite: Ca5(PO4)3(OH) Chlorapatite: Ca5(PO4)3Cl Carbonate-rich apatite/francolite: Ca5(PO4,CO3)3(F,O) here the sentence means like above written flourapatite (po4) is the phosphate group and at that place vanadium and arsenic can also be present because of there simillar size and charge so they are called as in solidsolution.