Coesite Levien L, Prewitt C T American Mineralogist 66 (1981) 324-333 High-pressure crystal structure and compressibility of coesite P = 21.8 kbar _database_code_amcsd 0000818 7.0692 12.306 7.1462 90 120.53 90 C2/c atom x y z Biso Si1 .1385 .1089 .0714 0.42 Si2 .5078 .1578 .5426 0.41 O1 0 0 0 0.90 O2 .5 .1124 .75 0.64 O3 .2605 .1259 .9346 0.66 O4 .3144 .1020 .3266 0.76 O5 .0217 .2123 .4745 0.82