Citation: Ross, C.R.II.; Paris, E.; Rubie, D.C. (1990). Montesommaite, (K, Na)9 Al9 Si23 O64 * 10(H2 O), a new zeolite related to merlinoite and the gismondine group. American Mineralogist, 75, pp. 1415-1420.
Formula: Al4.5 H8 K4.5 O36 Si11.5
Chemical name: K4.5 (Al4.5 Si11.5 O32) (H2 O)4
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Al16 O32 Si16 (Al O2 Si)
Multiplicity: 1
Coordination sequences: