Helium Schuch A F, Grilly E R, Mills R L Physical Review 110 (1958) 775-775 Structure of the alpha and beta forms of solid He Locality: synthetic Sample: at T = 1.9 K & P = .01 GPa Note: structure known as the alpha form _database_code_amcsd 0015153 4.01 4.01 4.01 90 90 90 Im3m atom x y z He 0 0 0