Gillespite Belsky H L, Rossman G R, Prewitt C T, Gasparik T American Mineralogist 69 (1984) 771-776 Crystal structure and optical spectroscopy (300 to 2200 nm) of CaCrSi4O10 _database_code_amcsd 0000954 7.378 7.378 15.119 90 90 90 P4/ncc atom x y z B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3) Ca 0 0 0 .00307 .00307 .00092 0 0 0 Cr 0 .5 .07951 .00171 .00171 .00127 0 0 0 Si .25310 .17208 .14801 .00185 .00189 .00084 0.00009 0.00003 -.00006 O1 .20819 .20819 .25 .00809 .00809 .00180 -.00125 0.00068 -.00068 O2 .45499 .24829 .12833 .00168 .00511 .00159 -.00067 -.00015 0.00050 O3 .10627 .25049 .08189 .00262 .00221 .00183 0.00049 -.00059 -.00005