AM_Thulium Formula: Tm Name: Thulium Unit cell: 3.5375 3.5375 5.5546 90.0 90.0 120.0 , V=60.20 Space group: P63/MMC (194)

Spedding F H , Daane A H , Herrmann K W , Acta Crystallographica , 9 (1956) p.559-563, The crystal structures and lattice parameters of high-purity scandium,, yttrium and the rare earth metals, Locality: synthetic, Note: sample 99.9% pure