Weberite Knop O, Cameron T S, Jochem K Journal of Solid State Chemistry 43 (1982) 213-221 What is the true space group of weberite? Locality: Ivigtut, Greenland Sample: Imm2 refinement, T = ambient _database_code_amcsd 0013479 7.051 9.968 7.285 90 90 90 Imm2 atom x y z U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) Na1 .2492 0 .4986 .0181 .0196 .0556 0 -.0049 0 Na2 0 .2534 .7503 .0229 .0332 .0150 0 0 -.0097 Mg .2499 0 0 .0078 .0067 .0075 0 .0007 0 Al 0 .2499 .2503 .0082 .0073 .0076 0 0 -.0018 F1 0 0 .8844 .0109 .0195 .0164 0 0 0 F2 0 .5 .6119 .0056 .0196 .0096 0 0 0 F3 0 .1663 .4700 .0222 .0153 .0113 0 0 .0006 F4 0 .3367 .0282 .0151 .0174 .0084 0 0 .002 F5 .1838 .1378 .1805 .0129 .0159 .0154 -.0001 .0014 -.0094 F6 .3165 .1371 .8198 .0136 .0109 .0189 -.0067 .0022 .0026