Tarapacaite McGinnety J A Acta Crystallographica B28 (1972) 2845-2852 Redetermination of the structures of potassium sulphate and potassium chromate: the effect of electrostatic crystal forces upon observed bond length _database_code_amcsd 0009457 7.663 10.388 5.922 90 90 90 Pnam atom x y z B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3) K1 .66544 .41449 .25 .00550 .00556 .01479 -.00054 0 0 K2 -.01105 .69980 .25 .00509 .00334 .01428 .00012 0 0 Cr .22900 .42059 .25 .00334 .00254 .00861 -.00008 0 0 O1 .0155 .4200 .25 .0041 .0071 .0290 -.0007 0 0 O2 .3024 .5700 .25 .0081 .0036 .0227 -.0017 0 0 O3 .3022 .3471 .0233 .0123 .0068 .0128 .0026 .0009 -.0032