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REE Mineralogy and Resources Chapter 279 237 TABLE 15 Representative Apatite-Group Minerals—Cont’d Endmember Formula Space Supergroup Mineral Name (Reduced) Group Type Fluorcalciobritholite (Ca,REE)5(SiO4,PO4)3F P63/m Britholite Chlorellestadite Ca5(SiO4,SO3)3Cl P63 or Ellestadite P63/m Fluorellestadite Ca5(SiO4,SO3)3 F P63/m Ellestadite Hydroxylellestadite Ca5(SiO4,SO3)3(OH) P21/m Ellestadite Mattheddleite Pb5(SiO4,SO4)3Cl P63/m Ellestadite Borosilicate Melanocerite-(Ce) Ce5(Si,B)3O12(OH,F) nH2O ? Britholite Tritomite-(Ce) Ce5(Si,B)3(O,OH,F)13 P63/m Britholite Tritomite-(Y) Y5(Si,B)3(O,OH,F)13 P63/m Britholite Sulfate Aiolosite Na2(Na2Bi)(SO4)3Cl P63/m Hedyphane Cesanite (Na,Ca)5(SO4)3(OH) P63/m Hedyphane Caracolite (Na,Pb)5(SO4)3Cl P21/m Hedyphane Vanadate Vanadinite Pb5(VO4)3Cl P63/m Apatite After Pan, Y., Fleet, M.E., 2002. Compositions of the Apatite-group minerals: substitution mechanisms and controlling factors. In: Kohn, M.J., Rakovan, J., Hughes, J.M. (Eds.), Phosphates— Geochemical, Geobiological, and Materials Importance, Reviews in Mineralogy and Geochemistry, vol. 48, 13–49; Pekov, I.V., Zubkova, N.V., Husdal, T.A., Kononkova, N.N., Aqakhanov, A.A., Zadov, A.E., Pushcharovsky, D.Y., 2012. Carlgesecieite-(Nd), NaNdCa3(PO4)3F, a new belovite- group mineral species from the Il ́ımaussaq alkaline complex, south Greenland. Can. Mineral. 50, 571–580; Hughes, J.M., Rakovan, J.F., 2015. Structurally robust, chemically diverse: apatite and apatite supergroup minerals. Elements 11, 165–170. compounds with apatite structure have been reported (Pan and Fleet, 2002). According to the differences in formation environment of the natural apatite-group minerals, various chemical substitutions occur among them to yield varieties of the chemical compositions in apatite-group minerals. Hence it is fundamentally important to understand the substitution mechanisms and other factors, both intrinsic and extrinsic, that control the compositional varia- tions in the apatite (Pan and Fleet, 2002). Based on which anion, ie, fluorine, OH, or chlorine is dominant on the halogen site, apatite is, respectively, divided into fluorapatite, hydroxyapatite,PDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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