Moganite Heaney P J, Post J E American Mineralogist 86 (2001) 1358-1366 Evidence for an I2/a to Imab phase transition in the silica polymorph moganite at ~570 K Sample: T = 1354 K _database_code_amcsd 0002738 8.8159 4.9371 10.7605 90 90 90 Imab atom x y z Uiso Si1 .25 0 0 .03 Si2 0 .2255 .1701 .03 O1 0 .0416 .2935 .03 O2 .1471 .2007 .0824 .03