AM_Hydroxy-dravite_6
Formula: Na.677 Ca.11 K.01 Mg2.088 Al6.111 Fe.783 Ti.042 Zn.009 Mn.006 V.006 Si5.958 B3 O30.98 F.02 H.618
Name: Hydroxy-dravite
Unit cell: 15.9541 15.9541 7.2035 90.0 90.0 120.0 , V=1587.88
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 TM65e, Locality: Arendal, Norway