Berzelianite Yamamoto K, Kashida S Journal of Solid State Chemistry 93 (1991) 202-211 X-ray study of the average structures of Cu2Se and Cu1.8S in the room temperature and the high temperature phases Note: Sample: Cu2Se (high) Model 1, T = 433 K Locality: synthetic _database_code_amcsd 0019148 5.787 5.787 5.787 90 90 90 Fm3m atom x y z occ Uiso Cu1 .25 .25 .25 .64 .069 Cu2 .322 .322 .322 .09 .066 Se 0 0 0 .042