AM_Hydroxy-dravite_4
Formula: Na.558 Ca.257 K.002 Mg2.013 Al6.198 Fe.834 Ti.054 Zn.009 V.009 Cr.009 Mn.003 Si5.856 B3 O30.874 F.126 H.47
Name: Hydroxy-dravite
Unit cell: 15.9633 15.9633 7.1942 90.0 90.0 120.0 , V=1587.66
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 TM112a, Locality: Haddam, Connecticut, U.S.A.