AM_Dravite_4 Formula: Ca.156 Na.348 K.015 Al6.516 Mg1.359 Fe1.029 Ti.069 V.006 Cr.009 Mn.006 Si6 B3 O30.94 F.06 H3.094 Name: Dravite Unit cell: 15.935 15.935 7.16 90.0 90.0 120.0 , V=1574.52 Space group: R3M (160)

Bloodaxe E S , Hughes J M , Dyar M D , Grew E S , Guidotti C V , American Mineralogist , 84 (1999) p.922-928, Linking structure and chemistry in the schorl-dravite series, Sample O-T16-92