AM_Ludwigite Formula: Mg1.707 Fe1.214 Al.08 B O5 Name: Ludwigite Unit cell: 9.2411 12.2948 3.0213 90.0 90.0 90.0 , V=343.27 Space group: PBAM (55)

Irwin M B , Peterson R C , The Canadian Mineralogist , 37 (1999) p.939-943, The crystal structure of ludwigite, Locality: Crestmore quarry, California, USA