KMgF3 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 = 1.00 _database_code_amcsd 0008551 3.9897 3.9897 3.9897 90 90 90 Pm3m atom x y z K .5 .5 1/2 Mg 0 0 0 F .5 0 0