Citation: Wan, C.; Ghose, S. (1983). Parahilgardite, Ca6[B5O9]3Cl3*3H2O: a triclinic piezoelectric zeolite-type pentaborate. American Mineralogist, 68, pp. 604-613.
Formula: B5 Ca2 Cl H2 O10
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: B15 O27 (B5 O9)
Multiplicity: 1
Coordination sequences: