Uranophane - alpha Smith D K, Gruner J W, Lipscomb W N American Mineralogist 42 (1957) 594-618 The crystal structure of uranophane [Ca(H3O)2](UO2)2(SiO4)2.3H2O Locality: Chinkolobwe deposits, Belgian Congo, Africa _database_code_amcsd 0000081 15.97 7.07 6.68 90 97.3 90 P2_1 atom x y z Biso U1 .256 .787 .138 .35 U2 .756 .713 .138 .35 Si1 .282 .287 .335 .35 Si2 .782 .213 .335 .35 Ca .019 .750 .271 .35 O1 .374 .787 .138 .35 O2 .874 .713 .138 .35 O3 .136 .787 .129 .35 O4 .636 .713 .129 .35 O5 .257 .477 .197 .35 O6 .757 .403 .197 .35 O7 .257 .097 .197 .35 O8 .757 .023 .197 .35 O9 .231 .287 .533 .35 O10 .731 .213 .533 .35 O11 .381 .287 .433 .35 O12 .881 .213 .433 .35