Pb2OFCl Aurivillius B Chemica Scripta 11 (1977) 208-211 A case of mimetic twinning. The crystal structures of Pb2OFX (X=Cl, Br, and I) Locality: synthetic Sample: Pb2OFCl(H), part A of the twin, isostructural with blixite _database_code_amcsd 0012188 5.7293 5.7293 12.5602 90 90 90 Acmm atom x y z Biso Pb .2229 .25 .14635 .96 O 0 0 .25 1.4 F .5 0 .25 1.8 Cl .2258 .25 .5 1.0