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“Vanadium-dravite” NaMg 3 V 6 (Si 6 O 18 )(BO 3 ) 3 (OH) 3 OH (IMA number 1999-050) has been redefined as oxy-vanadium-dravite with end-member formula NaV 3 (V 4 Mg 2 )Si 6 O 18 (BO 3 ) 3 (OH) 3 O. The new name and the new formula have been approved by the CNMNC (IMA proposal 11-E). Oxy-vanadium-dravite occurs in the metamorphic rocks of the Sludyanka complex (southern Baikal region, Russia). The crystal structure of oxy-vanadium-dravite has been refined for the first time using single-crystal X-ray data, with a statistical index R1 for all reflections converging to 1.44%. The structure is rhombohedral, space group R3m, with the unit-cell parameters a = 16.1908(4), c = 7.4143(2) Å, V = 1683.21(7) Å 3 , Z = 3. The chemical characterization resulted in the empirical structural formula:

Oxy-vanadium-dravite, NaV 3 (V 4 Mg 2 )(Si 6 O 18 )(BO 3 ) 3 (OH) 3 O: Crystal structure and redefinition of the “vanadium-dravite” tourmaline