AM_Schorl_12 Formula: Na2.34 K.03 Fe6.75 Al19.35 Mn.36 Ti.09 Mg.09 Zn.09 Si17.64 B9 O90.72 F2.28 H17.72 Name: Schorl Unit cell: 15.997 15.997 7.179 90.0 90.0 120.0 , V=1591.01 Space group: R3M (160)

Ertl A , Kolitsch U , Prowatke S , Dyar M D , Henry D J , European Journal of Mineralogy , 18 (2006) p.583-588, The F-analogue of schorl from Grasstein, Trentino - South Tyrol, Italy: crystal, structure and chemistry, Locality: pegmatite at Grasstein, Trentino-South Tyrol, Italy