AM_Rubidium_9 Formula: Rb Name: Rubidium Unit cell: 5.697 5.697 5.697 90.0 90.0 90.0 , V=184.90 Space group: IM3M (229)

Kelly F M , Pearson W B , Canadian Journal of Physics , 33 (1955) p.17-24, The rubidium transition at ~180 K, Locality: synthetic, Sample: at T = 297 K, Note: specimen IV lattice parameter for this T is estimated