Selenium Keller R, Holzapfel W B, Schulz H Physical Review B16 (1977) 4404-4412 Effect of pressure on the atom positions in Se and Te Locality: synthetic Sample: at P = 7.70 GPa Note: known as alpha phase with trigonal structure _database_code_amcsd 0015166 3.810 3.810 5.110 90 90 120 P3_121 atom x y z Se .2486 0 1/3