AM_Dumortierite_4 Formula: Al6.64 Mg.09 Ti.07 Fe.04 Si2.84 B O17.979 F.021 H.81 Name: Dumortierite Unit cell: 4.69 11.7875 20.1823 90.0 90.0 90.0 , V=1115.75 Space group: PNMA (62)

Fuchs Y , Ertl A , Hughes J M , Prowatke S , Brandstatter F , Schuster R , European Journal of Mineralogy , 17 (2005) p.173-183, Dumortierite from the Gfohl unit, Lower Austria: chemistry, structure,, and infra-red spectroscopy, Sample: DUM1, Locality: Gfohl unit, Lower Austria