Polyhalite
Schlatti M, Sahl K, Zemann A, Zemann J
Tschermaks Mineralogische und Petrographische Mitteilungen 14 (1970) 75-86
Die kristallstruktur des polyhalits, K2Ca2Mg(SO4)4(H2O)2
_database_code_amcsd 0015636
11.69 16.330 7.60 91.6 90.0 91.9 F-1
atom      x      y      z Biso
K    .13189 .28615 .63004 1.30
Ca   .11914 .37120 .12619  .80
Mg        0      0      0  .75
S1   .12582 .07054 .63225  .65
S2   .12061 .17896 .11415  .68
O1   .02782 .12014 .59472 1.50
O2   .22760 .12428 .66306 1.04
O3   .10304 .01950 .78843 1.13
O4   .14787 .01101 .48555 1.35
O5   .13167 .22955 .27763 1.35
O6   .09617 .23414 .96862 1.34
O7   .02245 .11814 .13130 1.23
O8   .22550 .13457 .08081 1.13
Wat9 .13515 .45748 .63492 1.06