Vanthoffite Balic-Zunic T, Pamato M G, Nestola F Acta Crystallographica E76 (2020) 785-789 Redetermination and new description of the crystal structure of vanthoffite, Na6Mg(SO4)4 Locality: Surtsey, Iceland _database_code_amcsd 0021237 9.7761 9.1998 8.2040 90 113.518 90 P2_1/c atom x y z Uiso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) Na1 .31120 .01426 .46772 .0173 .0195 .0154 .0181 -.0002 .0088 .0005 Na2 .44443 .15141 .09037 .0262 .0266 .0187 .0259 -.0064 .0026 -.0002 Na3 .88822 .13860 .31627 .0231 .0257 .0206 .0305 .0040 .0190 .0039 Mg1 0 0 0 .0097 .0096 .0090 .0101 .0002 .0034 -.0002 S1 .14002 .30539 .22425 .01023 .0103 .0099 .0103 -.0010 .0039 -.0008 S2 .66143 .35283 .34685 .01116 .0109 .0099 .0126 .0001 .0046 .0006 O1 .03029 .18470 .1553 .0153 .0156 .0149 .0167 -.0076 .0077 -.0072 O2 .13531 .39708 .0752 .0169 .0222 .0155 .0159 .0009 .0105 .0041 O3 .0954 .39427 .3441 .0197 .0267 .0184 .0189 -.0037 .0145 -.0073 O4 .28894 .24382 .3187 .0198 .0118 .0182 .0251 .0011 .0028 .0031 O5 .66765 .19352 .3593 .0175 .0223 .0111 .0195 .0010 .0088 .0027 O6 .6464 .4160 .5023 .0208 .0270 .0198 .0219 -.0028 .0165 -.0052 O7 .80007 .40614 .3324 .0154 .0095 .0208 .0144 -.0026 .0031 .0005 O8 .53693 .39792 .1825 .0190 .0113 .0231 .0174 .0007 .0003 .0061