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Oxy-vanadium-dravite, NaV3(V4Mg2)(Si6O18)(BO3)3(OH)3O: Crystal structure and redefinition of the “vanadium-dravite” tourmaline
-
Ferdinando Bosi
,
Leonid Z. Reznitskii
Published/Copyright:
March 7, 2015
Abstract
“Vanadium-dravite” NaMg3V6(Si6O18)(BO3)3(OH)3OH (IMA number 1999-050) has been redefined as oxy-vanadium-dravite with end-member formula NaV3(V4Mg2)Si6O18(BO3)3(OH)3O. 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) Å3, Z = 3. The chemical characterization resulted in the empirical structural formula:
X(Na0.88K0.07□ 0.05)Y(V3+2.46Mg0.48Ti0.06)Z(V3+3.14Mg1.74Al0.91Cr3+0.21)T(Si5.99Al0.01O18)B(BO3)3V(OH)3W(O0.78OH0.14F0.08).
Ideally, the oxy-vanadium-dravite is related to oxy-dravite and oxy-chromium-dravite by the homovalent substitution V3+ → Al and V3+ → Cr3+ (respectively) at the Y and Z sites. The occurrence of solid-solutions among V3+, Cr3+, and Al have been observed in tourmalines from metamorphic rocks of the Sludyanka complex. Significant chemical variations in V3+, Cr3+, and Al were also observed within zoned crystals from Sludyanka, not belonging to the holotype specimen.
Keywords : Oxy-vanadium-dravite; tourmaline; crystal-structure refinement; electron microprobe; new end-member
Received: 2012-5-23
Accepted: 2012-10-7
Published Online: 2015-3-7
Published in Print: 2013-2-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
Oxy-vanadium-dravite;
tourmaline;
crystal-structure refinement;
electron microprobe;
new end-member
Articles in the same Issue
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- Hydrokenomicrolite, (□,H2O)2Ta2(O,OH)6(H2O), a new microlite-group mineral from Volta Grande pegmatite, Nazareno, Minas Gerais, Brazil
- Fluor-elbaite, Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3F, a new mineral species of the tourmaline supergroup
- Microtexture development during rapid cooling in three rhyolitic lava flows
- Microbial and inorganic control on the composition of clay from volcanic glass alteration experiments
- High-pressure experiments on phase transition boundaries between corundum, Rh2O3(II)- and CaIrO3-type structures in Al2O3
- Electronic structure effects in the vectorial bond-valence model
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- Superstructure, crystal chemistry, and cation distribution in filipstadite, a Sb5+-bearing, spinel-related mineral
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- Hydrogen isotope fractionation between coexisting hydrous melt and silicate-saturated aqueous fluid: An experimental study in situ at high pressure and temperature
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- Lead-tellurium oxysalts from Otto Mountain near Baker, California: IX. Agaite, Pb3Cu2+Te6+O5(OH)2(CO3), a new mineral with CuO5-TeO6 polyhedral sheets
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