AM_Helium_7 Formula: He Name: Helium Unit cell: 3.65 3.65 5.945 90.0 90.0 120.0 , V=68.59 Space group: P63/MMC (194)

Schuch A F , Mills R L , Physical Review Letters , 8 (1962) p.469-470, Structure of the gamma form of solid He4, Locality: synthetic, Sample: at T = 1.73 K & P = .003 GPa