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Silicate

Vanadio-oxy-chromium-dravite

NaV₃(Cr₄Mg₂)(Si₆O₁₈)(BO₃)₃(OH)₃O
Hardness7.5
Crystal systemHexagonal
ClassSilicate
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Vanadio-oxy-chromium-dravite

Vanadio-oxy-chromium-dravite is an IMA-recognized mineral species in the silicate class, with the chemical formula NaV₃(Cr₄Mg₂)(Si₆O₁₈)(BO₃)₃(OH)₃O.

It crystallizes in the hexagonal crystal system (space group R-3m). It is a member of the Tourmaline structural group.

Key properties: Mohs hardness 7.5; specific gravity 3.3; Pale green streak; Vitreous luster; optically uniaxial.

IMA symbol Vocdrv, IMA status: approved, named in 2012.

Found as a primary mineral in metaquartzite (granulite facies) in marble.

It is found associated with Quartz, Cr-V-bearing tremolite, muscovite-celadonite-chromphyllite-roscoelite, diopside-kosmochlor-natalyite, Cr-bearing goldmanite, escolaite-karelianite.

As an oxy-chromium-dravite with dominant vanadium in the Y site and V3+ contents between 5 and 1.5 atoms per formula unit.

Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet. Browse more V minerals or help write this entry.