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: Dy-ClAp _database_code_amcsd 0002518 9.6487 9.6487 6.7652 90 90 120 P6_3/m atom x y z occ Biso Ca1 2/3 1/3 .00299 .933 1.20 Na1 2/3 1/3 .00299 .036 1.20 Dy1 2/3 1/3 .00299 .0306 1.20 Ca2 .00475 .25894 .25 .997 1.15 Dy2 .00475 .25894 .25 .0026 1.15 P .37565 .40844 .25 .97 O1 .4923 .3442 .25 1.40 O2 .4660 .5930 .25 1.39 O3 .2673 .3539 .0675 1.76 Cl 0 0 .4495 1.90