AM_Penobsquisite Formula: Ca2 Fe Cl B9 O23 H15 Name: Penobsquisite Unit cell: 11.62 9.407 8.726 90.0 98.58 90.0 , V=943.16 Space group: P1211 (4)

Grice J D , Gault R A , Van Velthuizen J , The Canadian Mineralogist , 34 (1996) p.657-665, Penobsquisite: A new borate mineral with a complex framework structure