Mineralogy Database

Bariandite Mineral Data

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General Bariandite Information

Help on Chemical  Formula: Chemical Formula: Al0.6V8O20•9(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Al0.6V5+8O20•9(H2O)
Help on Environment: Environment: U-V deposit in sandstone.
Help on IMA Status: IMA Status: Approved IMA 1971
Help on Locality: Locality: Mounana, Gabon. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Pierre Bariand (1933-), French mineralogist.
Help on Name Pronunciation: Name Pronunciation: Bariandite + Pronunciation Say BARIANDITE

Bariandite Image

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

Bariandite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =3.2231:1:8.0055
Help on Cell Dimensions: Cell Dimensions: a = 11.7, b = 3.63, c = 29.06, Z = 2; beta = 101.5° V = 1,209.43 Den(Calc)= 2.49
Help on Crystal System: 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/Io): 14.2(1), 3.43(0.6), 3.48(0.6),

Physical Properties of Bariandite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Blue black.
Help on Density: Density: 2.7
Help on Diaphaneity: Diaphaneity: Subopaque
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: black

Optical Properties of Bariandite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (?), a=1.85
Help on Pleochroism (x): Pleochroism (x): gray brown.
Help on Pleochroism (y): Pleochroism (y): brown.
Help on Pleochroism (z): Pleochroism (z): brown.

Calculated Properties of Bariandite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.43 gm/cc
note: Specific Gravity of Bariandite =2.49 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0013735916
Boson Index = 0.9986264084
Help on Photoelectric: Photoelectric: PEBariandite = 8.59 barns/electron
U=PEBariandite x rElectron Density= 20.87 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bariandite is Not Radioactive

Bariandite Classification

Help on  Dana Class: Dana Class: (47)Vanadium Oxysalts
  (47.03.02)Straczekite Group Straczekite (Ca,K,Ba)(V5,V4)8O20•3H2O C 2/m 2/m Corvusite (Na,Ca,K)V8O20•4(H2O) C 2/m 2/m Fernandinite CaV8O20•4(H2O) C 2/m 2/m Bariandite Al0.6V8O20•9(H2O) C 2/c 2/m Bokite (Al,Fe)1.3(V,Fe)8O20•4.7(H2O) C 2/m 2/m Kazakhstanite Fe5V3V12O39(OH)9•9(H2O) C 2/m 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: 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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Dana No: Strunz No: 04.HE.20





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