AM_Congolite Formula: (Fe2.4 Mg.6) B7 O13 Cl Name: Congolite Unit cell: 8.612 8.612 21.065 90.0 90.0 120.0 , V=1353.01 Space group: R3C (161)

Dowty E , Clark J R , Zeitschrift fur Kristallographie , 138 (1973) p.64-99, Crystal-structure refinements for orthorhombic boracite,, Mg3B7O13Cl, and a trigonal, iron-rich analogue, Locality: Bischofferode, Thuringen, Germany