Coesite Levien L, Prewitt C T American Mineralogist 66 (1981) 324-333 High-pressure crystal structure and compressibility of coesite P = 31.5 kbar _database_code_amcsd 0000819 7.0407 12.279 7.1342 90 120.610 90 C2/c atom x y z Biso Si1 .1378 .1093 .0711 0.44 Si2 .5081 .1576 .5434 0.43 O1 0 0 0 0.91 O2 .5 .1107 .75 0.69 O3 .2576 .1272 .9320 0.67 O4 .3157 .1020 .3263 0.76 O5 .0234 .2126 .4728 0.82