Chlorapatite Fleet M E, Liu X, Pan Y American Mineralogist 85 (2000) 1437-1446 Rare-earth elements in chlorapatite [Ca10(PO4)6(Cl)2]: Uptake, site preference, and degradation of monoclinic structure Sample: Nd-ClAp _database_code_amcsd 0002517 9.6474 9.6474 6.7747 90 90 120 P6_3/m atom x y z occ Biso Ca1 2/3 1/3 .0028 .983 1.13 Nd1 2/3 1/3 .0028 .0172 1.13 Ca2 .00310 .25786 .25 .952 1.21 Na2 .00310 .25786 .25 .029 1.21 Nd2 .00310 .25786 .25 .0191 1.21 P .37501 .4074 .25 1.06 O1 .4916 .3429 .25 1.51 O2 .4659 .5933 .25 1.52 O3 .2667 .3529 .0678 1.97 Cl 0 0 .4480 2.23