Rickardite Forman S A, Peacock M A American Mineralogist 34 (1949) 441-451 Crystal structure of rickardite, Cu4-xTe2 _database_code_amcsd 0000047 3.98 3.98 6.12 90 90 90 P4/nmm atom x y z occ Cu1 0 .0 0 Cu2 0 .5 .270 .4 Te 0 .5 .715