K2Ca2(SO4)3 Speer D, Salje E Physics and Chemistry of Minerals 13 (1986) 17-24 Phase transitions in langbeinites I: Crystal chemistry and structures of K-double sulfates of the langbeinite type M2++K2(SO4)3, M++=Mg,Ni,Co,Zn,Ca Sample: K2Ca2(SO4)3, T = 260 C _database_code_amcsd 0007370 10.4289 10.4289 10.4289 90 90 90 P2_13 atom x y z K1 .8158 .8158 .8158 K2 .0520 .0520 .0520 Ca1 .3301 .3301 .3301 Ca2 .5885 .5885 .5885 S1 .2281 .3746 .0095 O1 .3159 .2805 .9584 O2 .1008 .3224 .0088 O3 .2334 .4844 .9273 O4 .2652 .4156 .1352