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 = 8.50 GPa _database_code_amcsd 0003143 9.3836 8.5201 5.1560 90 106.776 90 C2/c atom x y z Biso Na2 0 .303 .25 1.2 Cr1 0 .9092 .25 .74 Si .2936 .0932 .2352 .77 O1 .1136 .079 .138 0.8 O2 .360 .264 .313 1.0 O3 .355 .017 .002 0.7