Apatite, the most common phosphate mineral, is generally described by the formula Ca5(PO4)3(OH,F,Cl) or, more completely with regard to its usual description in P63/m symmetry, by the unit cell content [Ca4][Ca6][(PO4)6][OH,F,Cl]2. An earlier volume of the Reviews series (Kohn et al. 2002) has dealt with the mineralogy and crystallography of apatite sensu stricto (Hughes and Rakovan 2002) and the diverse compounds that adopt apatite or apatite-like structures (Pan and Fleet 2002; Huminicki and Hawthorne...

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