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Bariandite

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Mounana Mine (Mouana Mine), Franceville, Haut-Ogooué Province, Gabon
© Vincent Bourgoin

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Formula:
Al
 
0.6
(V
5+
 
,V
4+
 
)
 
8
O
 
20
 · 9H
 
2
O
System:MonoclinicColour:Black to dark green
Member of:Straczekite Group
Name:For Dr. Pierre Bariand (b. 1933), Curator of Mineralogy, University of Paris, Paris, France.
This page provides mineralogical data about Bariandite.

Classification of Bariandite

IMA status:Approved 1970
Strunz 8th edition ID:4/G.11-10
Nickel-Strunz 10th (pending) edition ID:4.HE.20

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
E : Phyllovanadates
Dana 8th edition ID:47.3.2.4

47 : VANADIUM OXYSALTS
3 : Hydrated Normal Vanadium Oxysalts
Hey's CIM Ref.:7.12.10

7 : Oxides and Hydroxides
12 : Oxides of V, Nb and Ta
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Type Occurrence of Bariandite

Type Locality:Mounana Mine (Mouana Mine), Franceville, Haut-Ogooué Province, Gabon
Place of Conservation of Type Material:National School of Mines, Paris, France;
The Natural History Museum, London, England (No. 1970,151)
Geological Setting of type material:Oxidation zone of a uranium deposit
Associated Minerals at type locality:
LenobliteDuttonite

Occurrences of Bariandite

Geological Setting:Oxidation zones of uranium or vanadium deposits

Physical Properties of Bariandite

Diaphaneity (Transparency):Opaque
Colour:Black to dark green
Cleavage:Perfect
on {001}
Density (measured):2.7 g/cm3
Density (calculated):2.5 g/cm3

Crystallography of Bariandite

Crystal System:Monoclinic
Cell Parameters:a = 11.7Å, b = 3.63Å, c = 20.06Å
β = 101.5°
Ratio:a:b:c = 3.223 : 1 : 5.526
Unit Cell Volume:V 834.86 ų (Calculated from Unit Cell)
Z:2
Morphology:Crystals platy on {001} and elongated parallel to [010], forming fibers, to 3 mm; sheeted aggregates of parallel fibers, sometimes stacked.
X-Ray Powder Diffraction:
d-spacingIntensity
14.20 (sss)
3.480 (s)
3.430 (s)
5.72 (ms)
2.852 (ms)
1.939 (ms)
1.827 (ms)
Comments:From type description.

Optical Data of Bariandite

Type:Biaxial
RI values: n = 1.85
Maximum Birefringence:δ = 0.000

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Colour in reflected light:Brownish grey
Internal Reflections:Green
Comments:In transmitted light: greenish brown parallel to [010], bottle-green perpendicular to [010]

Chemical Properties of Bariandite

Formula:
Al
 
0.6
(V
5+
 
,V
4+
 
)
 
8
O
 
20
 · 9H
 
2
O
Essential elements:Al, H, O, V
All elements listed in formula:Al, H, O, V
Analytical Data:Analysis of material from Mounana Mine, Gabon
V2O5 (63.26)
V2O4 (14.19)
Al2O3 (3.75)
Fe2O3 (0.17)
H2O (18.11)

sum 99.48 wt.-%
Empirical Formula:
Al
 
0.68
[(V
5+
 
,V
4+
 
)
 
7.90
Fe
3+
0.02
]
 
=7.92
O
 
20
 · 9.14H
 
2
O

Relationship of Bariandite to other Species

Member of:Straczekite Group
Other Members of Group:

- +
Bokite
(Al,Fe
3+
 
)
 
1.3
(V
5+
 
,V
4+
 
,Fe
3+
 
)
 
8
O
 
20
 · 7.4H
 
2
O
Corvusite
(Na,K,Ca,Mg)
 
2
(V
5+
 
,V
4+
 
,Fe
2+
 
)
 
8
O
 
20
 · 6-10H
 
2
O
Fernandinite
(Ca,K)(V
5+
 
,V
4+
 
,Fe
2+
 
)
 
8
O
 
20
 · 10H
 
2
O
Straczekite
(Ca,K,Ba)(V
5+
 
,V
4+
 
)
 
8
O
 
20
 · 3H
 
2
O
Related Minerals - Nickel-Strunz Grouping):

- +
4.HE.05Melanovanadite
Ca
 
2
(V
5+
 
,V
4+
 
)
 
4
O
 
10
 · 5H
 
2
O
4.HE.10Shcherbinaite
V
5+
2
O
 
5
4.HE.15Hewettite
CaV
 
6
O
 
16
 · 9H
 
2
O
4.HE.15Metahewettite
CaV
 
6
O
 
16
 · 3H
 
2
O
4.HE.20Bokite
(Al,Fe
3+
 
)
 
1.3
(V
5+
 
,V
4+
 
,Fe
3+
 
)
 
8
O
 
20
 · 7.4H
 
2
O
4.HE.20Corvusite
(Na,K,Ca,Mg)
 
2
(V
5+
 
,V
4+
 
,Fe
2+
 
)
 
8
O
 
20
 · 6-10H
 
2
O
4.HE.20Fernandinite
(Ca,K)(V
5+
 
,V
4+
 
,Fe
2+
 
)
 
8
O
 
20
 · 10H
 
2
O
4.HE.20Straczekite
(Ca,K,Ba)(V
5+
 
,V
4+
 
)
 
8
O
 
20
 · 3H
 
2
O
4.HE.25Häggite
V
3+
 
V
4+
 
O
 
2
(OH)
 
3
4.HE.30Doloresite
V
4+
3
O
 
4
(OH)
 
4
4.HE.35Duttonite
V
4+
 
O(OH)
 
2
4.HE.40Cavoite
CaV
4+
3
O
 
7
Related Minerals - Hey's Index Grouping:

- +
7.12.1Montroseite
(V
3+
 
,Fe
3+
 
)O(OH)
7.12.2 Scherbinaite
7.12.3Paramontroseite
V
4+
 
O
 
2
7.12.4Häggite
V
3+
 
V
4+
 
O
 
2
(OH)
 
3
7.12.5Duttonite
V
4+
 
O(OH)
 
2
7.12.6Doloresite
V
4+
3
O
 
4
(OH)
 
4
7.12.7Lenoblite
V
4+
2
O
 
4
 · 2H
 
2
O
7.12.8Navajoite
Fe
3+
 
V
5+
9
O
 
24
 · 12H
 
2
O
7.12.9Vanoxite
V
4+
4
V
5+
2
O
 
13
 · 8H
 
2
O
7.12.11Corvusite
(Na,K,Ca,Mg)
 
2
(V
5+
 
,V
4+
 
,Fe
2+
 
)
 
8
O
 
20
 · 6-10H
 
2
O
7.12.12Simplotite
CaV
4+
4
O
 
9
 · 5H
 
2
O
7.12.13Kyzylkumite
BeV
3+
2
TiO
 
6
7.12.14Schreyerite
V
3+
2
Ti
 
3
O
 
9
7.12.15Berdesinskiite
V
3+
2
TiO
 
5
7.12.16Tivanite
V
3+
 
TiO
 
3
(OH)
7.12.17Mannardite
Ba
 
x
Ti
 
8-2x
V
 
2x
O
 
16
·2-xH
 
2
O
7.12.18Karelianite
V
3+
2
O
 
3
7.12.19Coulsonite
Fe
2+
 
V
3+
2
O
 
4
7.12.20Nolanite
(V
3+
 
,Fe
3+
 
,Fe
2+
 
,Ti)
 
10
O
 
14
(OH)
 
2
7.12.21Vuorelainenite
(Mn,Fe)(V,Cr)
 
2
O
 
4
7.12.22Tantite
Ta
 
2
O
 
5
7.12.23Kimrobinsonite
(Ta,Nb)(OH)
 
5-2x
(O,CO
 
3
)
 
x
 ; x near 1.2

Other Names for Bariandite

Synonyms:
IMA1970-043
Other Languages:
German:Bariandit
Spanish:Bariandita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Bariandite

Reference List:

- +
Cesbron, F. and Vachey, H. (1971): La bariandite, nouvel oxyde hydraté de vanadium (IV) et (V). Bull Soc. fr. Minéral. 94, 49-54 (in French with English abstract). - American Mineralogist (1972) 57, 1555 (abstract).

Evans, Jr., H.T., and Hughes, J.M. (1990): Crystal chemistry of the natural vanadium bronzes. American Mineralogist 75, 508-521.

Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 40.

Internet Links for Bariandite

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    • Localities for Bariandite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Gabon
     
    • Haut-Ogooué Province
      • Franceville
    		Bull.Soc.fr.Min.Crist.(1971) 94, 49-54
    Peru
     
    • Pasco department
      • Pasco province
        • Huayllay district
    		Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 40
    USA
     
    • Colorado
      • Montrose Co.
        • Uravan District
    		Minerals of Colorado (1997) Eckels, E. B.
    • Utah
      • Grand Co.
        • Yellow Cat District (W. part of Thompsons District)
          • Cisco
    		Van King
      • San Juan Co.
        • La Sal Quadrangle
    		Min Rec 33:4 pp351-355; Canadian Mineralogist (2001) 39, pp. 1691-1700
        • Paradox Valley
          • Paradox Valley District
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