Vanadiumdravite Mineral Data
General Vanadiumdravite Information
Chemical Formula:
NaMg3V6(Si6O18)(BO3)3(OH)4
Composition:
Molecular Weight = 1,109.10 gm
Potassium 0.35 % K 0.42 % K2 O
Sodium 1.87 % Na 2.51 % Na2 O
Magnesium 5.04 % Mg 8.36 % MgO
Aluminum 1.46 % Al 2.76 % Al2 O3
Vanadium 26.64 % V 39.19 % V2 O3
Chromium 2.34 % Cr 3.07 % CrO
Silicon 15.19 % Si 32.50 % SiO2
Boron 2.92 % B 9.42 % B2 O3
Hydrogen 0.30 % H 2.68 % H2 O
Oxygen 43.71 % O
Fluorine 0.17 % F 0.17 % F
- %
F -0.07 % -O=F2
______ ______
100.00 % 101.01 % = TOTAL OXIDE
Empirical Formula:
Na0.9 K0.1 Mg2.3 Al0.6 Cr0.5 V3+ 5.8 (Si6 O18 )(BO3 )3 (F)0.1 (OH)3.3
Environment:
Accessory mineral in metamorphic rocks with quartz and Cr-V bearing diopside. Tourmaline group.
IMA Status:
Approved IMA 2002 (Dana # Added)
Locality:
Slyudyanka complex, Lake Baikal region, Zabaikalye (Transbaikal), Siberia, Russia. Link to MinDat.org Location Data.
Name Origin:
Named for its vanadium content and the mineral dravite.
Synonym:
IMA1999-050
Tourmaline
Vanadiumdravite Image
Images:
Vanadiumdravite Crystallography
Axial Ratios:
a:c = 1:0.45843
Cell Dimensions:
a = 16.12, c = 7.39, Z = 3; V = 1,663.05 Den(Calc)= 3.32
Crystal System:
Trigonal - Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
X Ray Diffraction:
By Intensity(I/Io ): 2.62(1)(051), 2.07(0.9)(152), 3.04(0.9)(410), 6.54(0.9)(101), 4.04(0.8)(220), 3.57(0.7)(012), 1.951(0.5)(342),
Physical Properties of Vanadiumdravite
Cleavage:
{101} Imperfect, {110} Imperfect
Color:
Dark green, Black.
Density:
3.32
Diaphaneity:
Translucent to opaque
Fracture:
Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Habit:
Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Hardness:
7.5 - Garnet
Luster:
Resinous
Streak:
yellowish brownish green
Optical Properties of Vanadiumdravite
Gladstone-Dale:
CI meas = 0.052 (Good) - where the CI = (1-KPDmeas /KC ) CI calc = 0.052 (Good) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.2282,KPDmeas = 0.2282,KC = 0.2406 Ncalc = 1.8
Optical Data:
Uniaxial (-), e=1.729, w=1.786, bire=0.0570.
Calculated Properties of Vanadiumdravite
Electron Density:
Bulk Density (Electron Density)=3.22 gm/cc note: Specific Gravity of Vanadiumdravite =3.32 gm/cc.
Fermion Index:
Fermion Index = 0.02 Boson Index = 0.98
Photoelectric:
PEVanadiumdravite = 6.39 barns/electronU=PEVanadiumdravite x r electron = 20.58 barns/cc.
Radioactivity:
GRapi = 4.95 (Gamma Ray American Petroleum Institute Units)
Concentration of Vanadiumdravite per GRapi unit = 20.22 (%)
Estimated Radioactivity from Vanadiumdravite - barely detectable
Vanadiumdravite Classification
Dana Class:
61.03e.01.12 (61) Cyclosilicate Six-Membered Rings
(61.03e) with borate groups (Sodic Tourmaline Subgroup)
(61.03e.01) Schorl Subgroup
61.03e.01.09 Dravite ! NaMg3Al6(BO3)3Si6O18(OH)4 R 3m 3m
61.03e.01.10 Schorl ! NaFe3Al6(BO3)3Si6O18(OH)4 R 3m 3m
61.03e.01.10a Schorl-(F) ! NaFe3Al6Si6O18)(BO3)3(OH)3(F,OH) R 3m 3m
61.03e.01.11 Chromdravite ! NaMg3(Cr,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m
61.03e.01.12 Vanadiumdravite ! NaMg3V6(Si6O18)(BO3)3(OH)4 R 3m 3m
Strunz Class:
09.CK.05 09 - SILICATES (Germanates)
09.C - Cyclosilicates
09.CK -[Si6O18]12- 6-membered single rings, with insular complex anions
09.CK.05 Chromdravite ! NaMg3(Cr,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m
09.CK.05 Feruvite ! (Ca,Na)(Fe,Mg,Ti)3(Al,Mg,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m
09.CK.05 Dravite NaMg3Al6(BO3)3Si6O18(OH)4 R 3m 3m
09.CK.05 Buergerite ! NaFe3Al6(BO3)3Si6O21F R 3m 3m
09.CK.05 Foitite ! []Na<0.5(Fe,Al)3Al6Si6O18(BO3)3(OH)4 R 3m 3m
09.CK.05 Liddicoatite ! Ca(Li,Al)3Al6(BO3)3Si6O18(O,OH,F)4 R 3m 3m
09.CK.05 Elbaite Na(Li,Al)3Al6(BO3)3Si6O18(OH)4 R 3m 3m
09.CK.05 Rossmanite ! []LiAl2Al6(Si6O18)(BO3)3(OH)4 R 3m 3m
09.CK.05 Olenite ! NaAl3Al6(BO3)3(Si6O18)(O,OH)4 R 3m 3m
09.CK.05 Povondraite ! (Na,K)(Fe,Fe)3(Fe,Mg,Al)6(BO3)3Si6O18(OH)4 R 3m 3m
09.CK.05 Schorl NaFe3Al6(BO3)3Si6O18(OH)4 R 3m 3m
09.CK.05 Uvite (Ca,Na)(Mg,Fe)3Al5Mg(BO3)3Si6O18(OH,F)4 R 3m 3m
09.CK.05 Vanadiumdravite ! NaMg3V6(Si6O18)(BO3)3(OH)4 R 3m 3m
09.CK.05 Magnesiofoitite ! [](Mg2Al)Al6(Si6O18)(BO3)3(OH)4 R 3m 3m
09.CK.05 Hydroxyuvite ! CaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH) R 3m 3m
09.CK.05 Schorl-(F) ! NaFe3Al6Si6O18)(BO3)3(OH)3(F,OH) R 3m 3m
Other Vanadiumdravite Information
References:
NAME( AmMin, Vol 87, p 1512) PHYS. PROP.(AmMin, Vol 87, p 1512) OPTIC PROP.(AmMin, Vol 87, p 1512)
See Also:
Links to other databases for Vanadiumdravite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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Vanadiumdravite
NaMg3V6(Si6O18)(BO3)3(OH)4
Dana No: 61.03e.01.12 Strunz No: 09.CK.05
Locality:
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