Citation: Rouse, R. C.; Dunn, P. J.; Grice, J. D.; Schlenker, J. L.; Higgins, J. B. (1990). Montesommaite, (K,Na)9Al9Si23O64.10H2O, a new zeolite related to merlinoite and the gismondine group. American Mineralogist, 75, pp. 1415-1420.
Formula: Al0.58 H0.668 K O6.25 Si1.42
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: