AM_Dravite_12 Formula: Na.888 Ca.028 K.022 Cr3.15 Mg2.169 Al3.354 V.279 Zn.015 Ti.003 Fe.036 Si5.988 B3 O30.741 F.259 H3.034 Name: Dravite Unit cell: 15.9911 15.9911 7.2764 90.0 90.0 120.0 , V=1611.40 Space group: R3M (160)

Bosi F , Lucchesi S , Reznitskii L , European Journal of Mineralogy , 16 (2004) p.345-352, Crystal chemistry of the dravite-chromdravite series, Note: Tourmaline TM1p43e, Locality: Sludyanka crystalline complex, Lake Baikal, Russia