Kosmochlor Origlieri M J, Downs R T, Thompson R M, Pommier C J S, Denton M B, Harlow G E American Mineralogist 88 (2003) 1025-1032 High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes Sample: P = 6.25 GPa _database_code_amcsd 0003139 9.4295 8.5700 5.1844 90 106.999 90 C2/c atom x y z Biso Na2 0 .3034 .25 1.3 Cr1 0 .9087 .25 .80 Si .2929 .0935 .2343 .86 O1 .115 .0805 .138 0.8 O2 .362 .2622 .313 1.1 O3 .354 .0150 .002 0.9