Vanadiumdravite Mineral Data

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 % K₂O

Sodium 1.87 % Na 2.51 % Na₂O

Magnesium 5.04 % Mg 8.36 % MgO

Aluminum 1.46 % Al 2.76 % Al₂O₃

Vanadium 26.64 % V 39.19 % V₂O₃

Chromium 2.34 % Cr 3.07 % CrO

Silicon 15.19 % Si 32.50 % SiO₂

Boron 2.92 % B 9.42 % B₂O₃

Hydrogen 0.30 % H 2.68 % H₂O

Oxygen 43.71 % O

Fluorine 0.17 % F 0.17 % F

- % F -0.07 % -O=F₂

______ ______

100.00 % 101.01 % = TOTAL OXIDE

Empirical Formula:

Na_0.9K_0.1Mg_2.3Al_0.6Cr_0.5V³⁺_5.8(Si₆O₁₈)(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

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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 PyramidalH-M Symbol (3m) Space Group: R 3m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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

Diaphaniety:

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

Optical Data:

Uniaxial (-), e=1.729, w=1.786, bire=0.0570.

Calculated Properties of Vanadiumdravite

Electron Density:

r_electron=3.22 gm/cc
note: r_{Vanadiumdravite}=3.32 gm/cc.

Fermion Index

Fermion Index = 0.02105
Boson Index = 0.97895

Photoelectric:

PE_{Vanadiumdravite}= 6.39 barns/electron
U=PE_{Vanadiumdravite} x r_electron= 20.58 barns/cc.

Radioactivity:

GRapi = 4.95 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Vanadiumdravite - barely detectable

Vanadiumdravite Classification

Dana Class:

61.3e.1.12 (61)Cyclosilicate Six-Membered Rings

(61.3e)with borate groups (Sodic Tourmaline Subgroup)

(61.3e.1)Dana Group

61.3e.1.9 Dravite! NaMg3Al6(BO3)3Si6O18(OH)4 R 3m 3m

61.3e.1.10 Schorl! NaFe3Al6(BO3)3Si6O18(OH)4 R 3m 3m

61.3e.1.11 Chromdravite! NaMg3(Cr,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m

61.3e.1.12 Vanadiumdravite ! NaMg3V6(Si6O18)(BO3)3(OH)4 R 3m 3m

Strunz Class:

VIII/E.19-35 VIII - Silicates

VIII/E - Cyklosilicates, six rings [Si6O18]12-

VIII/E.19 - Tourmaline group

VIII/E.19-05 Rossmanite! []LiAl2Al6(Si6O18)(BO3)3(OH)4 R 3m 3m

VIII/E.19-10 Elbaite Na(Li,Al)3Al6(BO3)3Si6O18(OH)4 R 3m 3m

VIII/E.19-15 Magnesiofoitite! [](Mg2Al)Al6(Si6O18)(BO3)3(OH)4 R 3m 3m

VIII/E.19-20 Dravite NaMg3Al6(BO3)3Si6O18(OH)4 R 3m 3m

VIII/E.19-30 Chromdravite! NaMg3(Cr,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m

VIII/E.19-35 Vanadiumdravite NaMg3V6(Si6O18)(BO3)3(OH)4 R 3m 3m

VIII/E.19-50 Schorl NaFe3Al6(BO3)3Si6O18(OH)4 R 3m 3m

VIII/E.19-55 Foitite! []Na<0.5(Fe,Al)3Al6Si6O18(BO3)3(OH)4 R 3m 3m

VIII/E.19-60 Olenite! NaAl3Al6(BO3)3(Si6O18)(O,OH)4 R 3m 3m

VIII/E.19-70 Buergerite! NaFe3Al6(BO3)3Si6O21F R 3m 3m

VIII/E.19-75 Povondraite! (Na,K)(Fe,Fe)3(Fe,Mg,Al)6(BO3)3Si6O18(OH)4 R 3m 3m

VIII/E.19-80 Liddicoatite! Ca(Li,Al)3Al6(BO3)3Si6O18(O,OH,F)4 R 3m 3m

VIII/E.19-90 Uvite (Ca,Na)(Mg,Fe)3Al5Mg(BO3)3Si6O18(OH,F)4 R 3m 3m

VIII/E.19-100 Feruvite! (Ca,Na)(Fe,Mg,Ti)3(Al,Mg,Fe)6(BO3)3Si6O18(OH)4 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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Vanadiumdravite

NaMg3V6(Si6O18)(BO3)3(OH)4
Dana No: 61.3e.1.12 Strunz No: VIII/E.19-35
Locality:

Notes: