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Vanadio-oxy-dravite, NaV 3 (Al 4 Mg 2 )(Si 6 O 18 )(BO 3 ) 3 (OH) 3 O, is a new mineral of the tourmaline supergroup. It is found in metaquartzites of the Pereval marble quarry (Sludyanka, Lake Baikal, Russia) in association with quartz, Cr-V-bearing tremolite and mica, diopside-kosmochlor-natalyite, Cr-bearing goldmanite, escolaite-karelianite, dravite-oxy-vanadium-dravite, V-bearing titanite and rutile, ilmenite, oxyvanite-berdesinskiite, shreyerite, plagioclase, scapolite, zircon, pyrite, and an unnamed oxide of V, Cr, Ti, U, and Nb. Crystals are green, transparent with a vitreous luster, pale green streak, and conchoidal fracture. Vanadio-oxy-dravite has a Mohs hardness of approximately 7½, and a calculated density of 3.14 g/cm 3 . In plane-polarized light, vanadio-oxy-dravite is pleochroic (O = yellow green and E = pale olive green) and uniaxial negative: ω = 1.693(5), ε = 1.673(5). Vanadio-oxy-dravite is rhombohedral, space group  R 3 m , with the unit-cell parameters  a  = 16.0273(3),  c  = 7.2833(1) Å,  V  = 1620.24(5) Å 3 ,  Z  = 3. Crystal-chemical analysis resulted in the empirical structural formula:

Vanadio-oxy-dravite, NaV 3 (Al 4 Mg 2 )(Si 6 O 18 )(BO 3 ) 3 (OH) 3 O, a new mineral species of the tourmaline supergroup