Citation: Grice, J. D.; Gault, R. A.; Van Velthuizen, J. (1996). Penobsquisite: A new borate mineral with a complex framework structure. The Canadian Mineralogist, 34, pp. 657-665.
Formula: B9 Ca2 Cl Fe H15 O23
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: B18 Cl2 Fe2 H12 O38 (B9 Cl Fe H6 O19)
Multiplicity: 1