AM_Rubidium_5 Formula: Rb Name: Rubidium Unit cell: 5.619 5.619 5.619 90.0 90.0 90.0 , V=177.41 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 = 90 K, Note: specimen III