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 = 4.2 GPa Note: cell parameters obtained by linear regression _database_code_amcsd 0001866 9.744 8.889 5.181 90 104.18 90 C2/c atom x y z Biso Ca 0 .30236 .25 .55 Fe 0 .90902 .25 .40 Si .28770 .09362 .23116 .42 O1 .12010 .09112 .15252 .65 O2 .36106 .24851 .32682 .70 O3 .35240 .02332 .98737 .68