RbSi crystallizes in the tetragonal I4_1/acd space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 8-coordinate geometry to eight equivalent Si(1) atoms. In the second Rb site, Rb(2) is bonded in a 6-coordinate geometry to six equivalent Si(1) atoms. Si(1) is bonded in a 10-coordinate geometry to three equivalent Rb(2), four equivalent Rb(1), and three equivalent Si(1) atoms.
RbSi crystallizes in the tetragonal I4_1/acd space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 8-coordinate geometry to eight equivalent Si(1) atoms. There are a spread of Rb(1)-Si(1) bond distances ranging from 3.62-3.83 Å. In the second Rb site, Rb(2) is bonded in a 6-coordinate geometry to six equivalent Si(1) atoms. There are a spread of Rb(2)-Si(1) bond distances ranging from 3.63-3.80 Å. Si(1) is bonded in a 10-coordinate geometry to three equivalent Rb(2), four equivalent Rb(1), and three equivalent Si(1) atoms. There are two shorter (2.41 Å) and one longer (2.43 Å) Si(1)-Si(1) bond length.