Coesite Levien L, Prewitt C T American Mineralogist 66 (1981) 324-333 High-pressure crystal structure and compressibility of coesite P = 1 atm isotropic refinement _database_code_amcsd 0000816 7.1356 12.3692 7.1736 90 120.34 90 C2/c atom x y z Biso Si1 .14033 .10833 .07227 0.41 Si2 .50682 .15799 .54077 0.40 O1 0 0 0 0.71 O2 .5 .1163 .75 0.68 O3 .2660 .1234 .9401 0.79 O4 .3114 .1038 .3282 0.81 O5 .0172 .2117 .4782 0.75