Effenbergerite Janczak J, Kubiak R Acta Crystallographica C48 (1992) 1299-1301 Refinement of the structure of barium copper silicate BaCu[Si4O10] at 300 K Locality: synthetic _database_code_amcsd 0018736 7.447 7.447 16.138 90 90 90 P4/ncc atom x y z Uiso Ba 0 0 0 .0100 Cu 0 .5 .0944 .0077 Si .2681 .1887 .1546 .0073 O1 .2261 .2261 .25 .0310 O2 .4736 .2484 .1366 .0160 O3 .1367 .2818 .0980 .0157