Bariandite Mineral Data

General Bariandite Information

Chemical Formula:

Al0.6V8O20•9(H2O)

Composition:

Molecular Weight = 905.85 gm

Aluminum 1.79 % Al 3.38 % Al₂O₃

Vanadium 44.99 % V 80.31 % V₂O₅

Hydrogen 2.00 % H 17.90 % H₂O

Oxygen 51.22 % O

______ ______

100.00 % 101.59 % = TOTAL OXIDE

Empirical Formula:

Al_0.6V⁵⁺₈O₂₀•9(H₂O)

Environment:

U-V deposit in sandstone.

IMA Status:

Approved IMA 1971

Locality:

Mounana, Gabon. Link to MinDat.org Location Data.

Name Origin:

Named for Pierre Bariand (1933-), French mineralogist.

Name Pronunciation:

Bariandite + Pronunciation

Bariandite Image

Images:

Bariandite

Comments: Dark bluish black bladed radiating aggregates of bariandite.
Location: Mounana mine, Franceville, Haut-OgoouÃ©, Gabon. Scale: See Image.
© Rruff Database

Bariandite Crystallography

Axial Ratios:

a:b:c =3.2231:1:8.0055

Cell Dimensions:

a = 11.7, b = 3.63, c = 29.06, Z = 2; beta = 101.5° V = 1,209.43 Den(Calc)= 2.49

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c

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

By Intensity(I/I_o): 14.2(1), 3.43(0.6), 3.48(0.6),

Physical Properties of Bariandite

Cleavage:

{001} Perfect

Color:

Blue black.

Density:

2.7

Diaphaneity:

Subopaque

Habit:

Fibrous - Crystals made up of fibers.

Luster:

Sub Metallic

Streak:

black

Optical Properties of Bariandite

Gladstone-Dale:

CI meas= 0.077 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.001 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3414,KPDmeas= 0.3148,KC= 0.3409
Ncalc = 1.85 - 1.92

Optical Data:

Biaxial (?), a=1.85

Pleochroism (x):

gray brown.

Pleochroism (y):

brown.

Pleochroism (z):

brown.

Calculated Properties of Bariandite

Electron Density:

Bulk Density (Electron Density)=2.43 gm/cc
note: Specific Gravity of Bariandite =2.49 gm/cc.

Fermion Index:

Fermion Index = 0.0013735916
Boson Index = 0.9986264084

Photoelectric:

PE_Bariandite= 8.59 barns/electron
U=PE_Bariandite x rElectron Density= 20.87 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bariandite is Not Radioactive

Bariandite Classification

Dana Class:

47.03.02.04 (47)Vanadium Oxysalts

(47.03)(Hydrated)

(47.03.02)Straczekite Group

47.03.02.01 Straczekite (Ca,K,Ba)(V5,V4)8O20•3H2O C 2/m 2/m

47.03.02.02 Corvusite (Na,Ca,K)V8O20•4(H2O) C 2/m 2/m

47.03.02.03 Fernandinite CaV8O20•4(H2O) C 2/m 2/m

47.03.02.04 Bariandite Al0.6V8O20•9(H2O) C 2/c 2/m

47.03.02.05 Bokite (Al,Fe)1.3(V,Fe)8O20•4.7(H2O) C 2/m 2/m

47.03.02.06 Kazakhstanite Fe5V3V12O39(OH)9•9(H2O) C 2/m 2/m

Strunz Class:

04.HE.20 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.H - V[5,6] Vanadates

04.HE -Phyllovanadates

04.HE.20 Bokite (Al,Fe)1.3(V,Fe)8O20•4.7(H2O) C 2/m 2/m

04.HE.20 Bariandite Al0.6V8O20•9(H2O) C 2/c 2/m

04.HE.20 Corvusite (Na,Ca,K)V8O20•4(H2O) C 2/m 2/m

04.HE.20 Fernandinite CaV8O20•4(H2O) C 2/m 2/m

04.HE.20 Straczekite (Ca,K,Ba)(V5,V4)8O20•3H2O C 2/m 2/m

Other Bariandite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Bariandite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Bariandite

Al0.6V8O20•9(H2O)
Dana No: 47.03.02.04 Strunz No: 04.HE.20
Locality:

Notes:

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