AM_Dravite_13 Formula: Na.96 Ca.02 Mg2.37 Al5.91 Fe.63 Ti.06 Si5.82 B3.18 O30.93 F.07 H3.93 Name: Dravite Unit cell: 15.9443 15.9443 7.2094 90.0 90.0 120.0 , V=1587.23 Space group: R3M (160)

Marschall H R , Ertl A , Hughes J M , McCammon C A , European Journal of Mineralogy , 16 (2004) p.817-823, Metamorphic Na- and OH-rich disordered dravite with tetrahedral boron,, associated with omphacite, from Syros, Greece: chemistry and structure, Sample: SY309B, Locality: Syros, Greece