Gillespite Miletich R, Allan D R, Angel R J American Mineralogist 82 (1997) 697-707 The synthetic Cr2+ silicates BaCrSi4O10 and SrCrSi4O10: The missing links in the gillespite-type ABSi4O10 series SrCrSi4O10 _database_code_amcsd 0001912 7.4562 7.4562 15.5414 90 90 90 *P4/ncc .25 -.25 0 atom x y z B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3) Sr .25 .75 0 .00518 .00518 .00128 0 0 0 Cr .25 .25 .08564 .00368 .00368 .00164 0 0 0 Si .50962 .92707 .15094 .00360 .00428 .00124 .00001 .00010 -.00002 O1 .46361 .96361 .25 .01102 .01102 .00173 -.00131 .00117 -.00117 O2 .71284 .99735 .13192 .00434 .00842 .00186 -.00094 -.00026 .00062 O3 .37015 .01058 .08572 .00460 .00385 .00252 .00130 -.00114 .00051