Citation: Ghose, S.; Wan, C. (1979). Hilgardite, Ca2[B5O9]Cl*H2O: a piezoelectric zeolite-type pentaborate. American Mineralogist, 64, pp. 187-195.
Formula: B5 Ca2 Cl H2 O10
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: B20 O36 (B5 O9)
Multiplicity: 1
Coordination sequences: