Lawsonite Libowitzky E, Armbruster T American Mineralogist 80 (1995) 1277-1285 Low-temperature phase transitions and the role of hydrogen bonds in lawsonite Sample: T = 233 K _database_code_amcsd 0001765 5.852 8.777 13.113 90 90 90 *Pmcn .25 .25 0 atom x y z Biso Ca 0 .33250 .25075 .553 Al .25 .25 0 .269 Ala .25 .25 .5 .283 Si 0 .98049 .13200 .285 Sia 0 .97895 .36589 .299 O1 0 .0498 .24919 .51 O2 .2749 .37470 .11942 .52 O2a .2716 .38008 .38420 .45 O3 0 .1375 .06359 .39 O3a 0 .1360 .43420 .42 O4 0 .6406 .05084 .44 O4a 0 .6346 .45757 .57 O5 0 .6089 .24855 1.19 Hw 0 .647 .187 3.4 Hwa 0 .677 .287 3.3 Hh 0 .555 .038 7.2 Hha 0 .571 .423 9.7