Shigaite Cooper M A, Hawthorne F C The Canadian Mineralogist 34 (1996) 91-97 The crystal structure of shigaite, [AlMn2(OH)6]3(SO4)2Na(H2O)6{H2O}6, a hydrotalcite-group mineral _database_code_amcsd 0005480 9.512 9.512 33.074 90 90 120 R-3 atom x y z Uiso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) Mn -.0011 .3336 .16671 .0066 .0062 .0261 .0031 .0003 .0008 Al1 0 0 .16475 .0054 .0054 .0118 .0027 0 0 Al2 1/3 2/3 1/6 .0050 .0050 .0146 .0025 0 0 Na 0 0 0 .0336 .0336 .0324 .0168 0 0 S 2/3 1/3 .03822 .0181 .0181 .0184 .0091 0 0 H1 .584 .156 .1082 .02 H2 .193 .109 .1052 .02 H3 .197 .475 .1087 .02 H4 .172 .507 .035 .07 H5 .004 .394 .054 .07 H6 .172 .262 .055 .07 H7 .320 .242 .045 .07 O1 1/3 2/3 .0063 .0342 .0342 .0118 .0171 0 0 O2 .6144 .1690 .0535 .0373 .0189 .0322 .0138 .0023 .0028 Oh1 .5705 .1373 .1374 .0114 .0072 .0112 .0046 .0009 -.0008 Oh2 .1979 .0984 .1346 .0072 .0101 .0146 .0037 .0021 .0014 Oh3 .2336 .4698 .1361 .0125 .0092 .0125 .0057 .0002 -.0002 OW1 .1180 .4236 .0556 .0280 .0381 .0302 .0165 .0034 .0077 OW2 .2036 .1794 .0501 .0245 .0297 .0384 .0122 .0018 -.0013