Ussingite Williams E R, Weller M T Physics and Chemistry of Minerals 39 (2012) 471-478 A variable-temperature neutron diffraction study of ussingite; a strong asymmetric hydrogen bond in an aluminosilicate framework Note: T = 4 K Locality: Nakalaq, Ilimaussaq complex, Greenland _database_code_amcsd 0019374 7.2474 7.6813 8.6432 90.835 99.771 122.581 P-1 atom x y z Uiso Na1 .1701 .3865 .0555 .00720 Na2 .8230 .2388 .4433 .01147 Al1 .2449 .0510 .8547 .00455 Si1 .2527 .1947 .3635 .00591 Si2 .3226 .4184 .6932 .00327 Si3 .7080 .1102 .8116 .00153 O1 .0024 .1355 .2846 .00476 O2 .1412 .4738 .6506 .00767 O3 .2743 -.0056 .3482 .00433 O4 .3019 .3000 .8519 .00601 O5 .4436 .0212 .7954 .00679 O6 .4194 .3740 .2703 .00789 O7 .8061 .0431 .9647 .00464 O8 .8608 .3594 .8196 .00612 O9 .3129 .2676 .5515 .00482 H .9820 .4147 .7465 .01299