Arisite-(La) Piilonen P C, McDonald A M, Grice J D, Cooper M A, Kolitsch U, Rowe R, Gault R A, Poirier G Mineralogical Magazine 74 (2010) 257-268 Arisite-(La), a new REE-fluorcarbonate mineral from the Aris phonolite (Namibia), with descriptions of the crystal structures of arisite-(La) and arisite-(Ce) Locality: Aris, Namibia Note: x-coordinate of O1 adjusted to special position _database_code_amcsd 0014599 5.1131 5.1131 8.6759 90 90 120 P-6m2 atom x y z occ Uiso Na 0 0 0 .014 La 2/3 1/3 .72574 .45 .011 Ce 2/3 1/3 .72574 .42 .011 Nd 2/3 1/3 .72574 .04 .011 Pr 2/3 1/3 .72574 .01 .011 Sm 2/3 1/3 .72574 .01 .011 Ca 2/3 1/3 .72574 .07 .011 C1 1/3 2/3 .804 .012 O1 .628 .814 .8013 .019 F 2/3 1/3 0 .032 C2 0 0 .5 .63 .044 O2 .847 .153 .5 .63 .025 F2 .847 .153 .5 .24 .025