Na.3K.7MgF3 Chakhmouradian A R, Ross K, Mitchell R H, Swainson I Physics and Chemistry of Minerals 28 (2001) 277-284 The crystal chemistry of synthetic potassium-bearing neighborite, (Na1-xKx)MgF3 Sample x = .70 _database_code_amcsd 0008548 3.9659 3.9659 3.9659 90 90 90 Pm3m atom x y z occ Na .5 .5 .5 .30 K .5 .5 .5 .70 Mg 0 0 0 F .5 0 0