Pb6[Ge6O18].2H20 Otto H H, Brandt H J European Journal of Mineralogy 8 (1996) 301-310 Crystal structure of Pb6[Ge6O18]2H2O, a lead cyclo-germanate similar to the mineral dioptase _database_code_amcsd 0006627 15.6476 15.6476 7.3119 90 90 120 R-3 atom x y z Uiso Pb .4119 .2870 .7983 .011 Ge .3775 .4884 .6440 .013 O1 .279 .483 .769 .013 O2 .335 .411 .457 .011 O3 .437 .454 .800 .008 Wat 0 0 .30 .17