Wesselsite Knight K S, Henderson C M B European Journal of Mineralogy 19 (2007) 189-200 Structural basis for the anomalous low-temperature thermal expansion behavior of the gillespite-structured phase Ba0.5Sr0.5CuSi4O10 Sample: T = 300 K _database_code_amcsd 0007214 7.39425 7.39425 15.8621 90 90 90 *P4/ncc .25 -.25 0 atom x y z occ Uiso Ba .25 .75 0 .5 .0819 Sr .25 .75 0 .5 .0704 Cu .25 .25 .0923 .0945 Si .5130 .9338 .15226 .0433 O1 .4519 .9877 .2457 .5 .1232 O2 .7188 -.0002 .13392 .1010 O3 .3750 .0247 .08834 .1041