AM_Oxy-dravite_3 Formula: Na.594 Ca.187 K.013 Al6.291 Mg2.214 Fe.342 Ti.144 V.039 Mn.012 Zn.006 Cr.006 Si5.952 B3 O30.946 F.054 H.442 Name: Oxy-dravite Unit cell: 15.9303 15.9303 7.1951 90.0 90.0 120.0 , V=1581.30 Space group: R3M (160)

Bosi F , Lucchesi S , European Journal of Mineralogy , 16 (2004) p.335-344, Crystal chemistry of the schorl-dravite series, Note: Tourmaline TM9840f, Locality: Lake Baikal, Siberia