AM_Americium_1 Formula: Am Name: Americium Unit cell: 3.474 3.474 11.25 90.0 90.0 120.0 , V=117.58 Space group: P63/MMC (194)

Wyckoff R W G , Crystal Structures , 1 (1963) p.7-83, Second edition. Interscience Publishers, New York, New York, Double hexagonal closest packed, dhcp, structure