Diopside Bindi L, Downs R T, Harlow G E, Safonov O G, Litvin Y A, Perchuk L L, Uchida H, Menchetti S American Mineralogist 91 (2006) 802-808 Compressibility of synthetic potassium-rich clinopyroxene: In situ high-pressure single-crystal X-ray study Sample: 939-1, P = 8.11 GPa _database_code_amcsd 0004151 9.5089 8.6937 5.1545 90 105.344 90 C2/c atom x y z occ Biso Ca2 0 .3053 .25 .88 .85 K2 0 .3053 .25 .12 .85 Mg1 0 .9091 .25 .83 .63 Al1 0 .9091 .25 .17 .63 Si .2863 .0947 .2247 .99 .54 Al .2863 .0947 .2247 .01 .54 O1 .1136 .0853 .1385 .95 O2 .3594 .2566 .3155 .98 O3 .3529 .0207 .9873 .81