Cuprite Hafner S S, Nagel S Physics and Chemistry of Minerals 9 (1983) 19-22 The electric field gradient at the position of copper in Cu2O and electronic charge density analysis by means of K-factors _database_code_amcsd 0007351 4.2696 4.2696 4.2696 90 90 90 Pn3 atom x y z Cu .25 .25 .25 O 0 0 0