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 = 155 K _database_code_amcsd 0001764 5.853 8.766 13.100 90 90 90 *Pmcn .25 .25 0 atom x y z Biso Ca 0 .33211 .25098 .409 Al .25 .25 0 .198 Ala .25 .25 .5 .226 Si 0 .98030 .13184 .232 Sia 0 .97837 .36563 .242 O1 0 .05004 .24891 .416 O2 .2756 .37319 .12012 .446 O2a .27153 .37979 .38414 .343 O3 0 .1373 .06313 .34 O3a 0 .1355 .43421 .33 O4 0 .6402 .05104 .35 O4a 0 .6328 .45915 .43 O5 0 .6087 .24826 .89 Hw 0 .642 .187 1.9 Hwa 0 .678 .287 3.5 Hh 0 .541 .035 3.6 Hha 0 .571 .415 7.1