Buddingtonite Mookherjee M, Redfern S A T, Swainson I, Harlov D E Physics and Chemistry of Minerals 31 (2004) 643-649 Low-temperature behaviour of ammonium ion in buddingtonite [N(D/H)4AlSi3O8] from neutron powder diffraction Sample: T = 280 K _database_code_amcsd 0008921 8.83157 13.08541 7.20024 90 116.147 90 C2/m atom x y z occ Uiso N .2955 0 .1486 .03027 D1 .4170 .0200 .2186 .5 .09924 D2 .2647 -.0360 .2492 .5 .09924 D3 .2762 -.0465 .0303 .5 .09924 D4 .2244 .0625 .0961 .5 .09924 Al1 .7065 .1192 .3474 .25 .01270 Si1 .7065 .1192 .3474 .75 .01270 Al2 .0222 .1936 .2365 .25 .01079 Si2 .0222 .1936 .2365 .75 .01079 O1 0 .1584 0 .00317 O2 .6652 0 .2898 .00317 O3 .8265 .1580 .2236 .00317 O4 .0418 .3123 .2631 .00317 O5 .1697 .1270 .4096 .00317