Hedenbergite Zhang L, Ahsbahs H, Hafner S S, Kutoglu A American Mineralogist 82 (1997) 245-258 Single-crystal compression and crystal structure of clinopyroxene up to 10 GPa Sample: at P = 0.0 GPa Note: cell parameters obtained by linear regression _database_code_amcsd 0001861 9.8389 9.0214 5.2424 90 104.797 90 C2/c atom x y z Biso Ca 0 .29953 .25 .68 Fe 0 .90720 .25 .44 Si .28784 .092495 .23270 .44 O1 .11965 .08995 .15206 .56 O2 .36290 .24596 .32346 .81 O3 .35021 .01994 .99292 .66