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: La-ClAp _database_code_amcsd 0002516 9.6499 9.6499 6.7725 90 90 120 P6_3/m atom x y z occ Biso Ca1 2/3 1/3 .00347 .963 1.26 Na1 2/3 1/3 .00347 .025 1.26 La1 2/3 1/3 .00347 .0126 1.26 Ca2 .00393 .25895 .25 .991 1.17 La2 .00393 .25895 .25 .0089 1.17 P .37530 .40780 .25 .97 O1 .4917 .3437 .25 1.37 O2 .4659 .5926 .25 1.41 O3 .2673 .3536 .0677 1.80 Cl 0 0 .4448 1.73