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⇱ Bariandite: Mineral information, data and localities.

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Bariandite

A valid IMA mineral species
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About BarianditeHide

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Formula:
Al0.6(V5+,V4+)8O20 · 9H2O
Colour:
Black to dark green
Specific Gravity:
2.7
Crystal System:
Monoclinic
Name:
Named 1971 by Fabien P. Cesbron and Helene Vachey in honor of Dr. Pierre Bariand [May 5, 1933 Limousin, France - July 25, 2021], Curator of Mineralogy, University of Paris, Paris, France.
Compare the chemically similar bokite.


Unique IdentifiersHide

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Mindat ID:
522
Long-form identifier:
mindat:1:1:522:3

Similar NamesHide

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BarranditeA synonym

IMA Classification of BarianditeHide

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Approved
IMA Formula:
Al0.6(V5+,V4+)8O20 · 9H2O
Approval year:
1970

Classification of BarianditeHide

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4.HE.20

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

47 : VANADIUM OXYSALTS
3 : Hydrated Normal Vanadium Oxysalts
7.12.10

7 : Oxides and Hydroxides
12 : Oxides of V, Nb and Ta

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference for Standard
BrdIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of BarianditeHide

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Transparency:
Opaque
Colour:
Black to dark green
Cleavage:
Perfect
on {001}
Density:
2.7 g/cm3 (Measured)    2.50 g/cm3 (Calculated)

Optical Data of BarianditeHide

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Type:
Biaxial
RI values:
n = 1.85
Max. Birefringence:
δ = 0.000
Based on recorded range of RI values above.

Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.

Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.

Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.

Surface Relief:
Very High
Colour in reflected light:
Brownish grey
Internal Reflections:
Green
Pleochroism:
Weak
Comments:
In transmitted light: greenish brown parallel to [010], bottle-green perpendicular to [010]
Comments:
n = > 1.85

Chemistry of BarianditeHide

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Mindat Formula:
Al0.6(V5+,V4+)8O20 · 9H2O
Element Weights:
Element% weight
O51.221 %
V44.989 %
H2.003 %
Al1.787 %

Calculated from ideal end-member formula.

Crystallography of BarianditeHide

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Crystal System:
Monoclinic
Cell Parameters:
a = 11.70(3) Å, b = 3.63(1) Å, c = 20.06(5) Å
β = 101.5°
Ratio:
a:b:c = 3.223 : 1 : 5.526
Unit Cell 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.
Comment:
Point Group: m or 2/m. Space Group: Cc or C2/c.

X-Ray Powder DiffractionHide

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Powder Diffraction Data:
d-spacingIntensity
14.20 Å(sss)
3.480 Å(s)
3.430 Å(s)
5.72 Å(ms)
2.852 Å(ms)
1.939 Å(ms)
1.827 Å(ms)
Comments:
From type description.

Geological EnvironmentHide

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Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 7: Great Oxidation Event<2.4
47a : [Near-surface hydration of prior minerals]
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere<0.6
53 : Other minerals with taphonomic origins<0.4
Geological Setting:
Oxidation zones of uranium or vanadium deposits

Type Occurrence of BarianditeHide

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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:

Synonyms of BarianditeHide

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Other Language Names for BarianditeHide

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German:Bariandit
Simplified Chinese:巴水钒矿
Spanish:Bariandita
Traditional Chinese:巴水釩礦

Relationship of Bariandite to other SpeciesHide

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Other Members of Straczekite Group:
Bokite(Al,Fe)1.3(V5+,V4+,Fe3+)8O20 · 7.5H2OMon.
Corvusite(Na,K,Ca,Mg)2(V5+,V4+,Fe2+)8O20 · 6-10H2OMon. 2/m : B2/m
Fernandinite(Ca,K)(V5+,V4+,Fe2+)8O20 · 10H2OMon. 2/m : B2/m
Straczekite(Ca,K,Ba)(V5+,V4+)8O20 · 3H2OMon. 2/m : B2/m

Common AssociatesHide

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Associations Based on Photo Data:
4 photos of Bariandite associated with RoscoeliteKV3+2(AlSi3O10)(OH)2
3 photos of Bariandite associated with LenobliteV4+2O4 · 2H2O
3 photos of Bariandite associated with PatróniteVS4
3 photos of Bariandite associated with MelanovanaditeCa(V5+,V4+)4O10 · 5H2O
3 photos of Bariandite associated with PyriteFeS2
3 photos of Bariandite associated with GypsumCaSO4 · 2H2O
3 photos of Bariandite associated with PascoiteCa2Ca(V10O28) · 17H2O
3 photos of Bariandite associated with HewettiteCaV6O16 · 9H2O
1 photo of Bariandite associated with MounanaitePbFe3+2(VO4)2(OH)2
1 photo of Bariandite associated with FrancevilliteBa(UO2)2(VO4)2 · 5H2O

Related Minerals - Strunz-mindat GroupingHide

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4.HE.05MelanovanaditeCa(V5+,V4+)4O10 · 5H2OTric. 1 : P1
4.HE.10ShcherbinaiteV5+2O5Orth. mmm(2/m2/m2/m) : Pmmn
4.HE.15HewettiteCaV6O16 · 9H2OMon. 2/m : P21/m
4.HE.15MetahewettiteCaV6O16 · 3H2OMon. 2/m
4.HE.20Corvusite(Na,K,Ca,Mg)2(V5+,V4+,Fe2+)8O20 · 6-10H2OMon. 2/m : B2/m
4.HE.20Bokite(Al,Fe)1.3(V5+,V4+,Fe3+)8O20 · 7.5H2OMon.
4.HE.20Fernandinite(Ca,K)(V5+,V4+,Fe2+)8O20 · 10H2OMon. 2/m : B2/m
4.HE.20Straczekite(Ca,K,Ba)(V5+,V4+)8O20 · 3H2OMon. 2/m : B2/m
4.HE.25HäggiteV3+V4+O2(OH)3Mon. 2/m : B2/m
4.HE.30DoloresiteV4+3O4(OH)4Mon. 2/m : B2/m
4.HE.35DuttoniteV4+O(OH)2Mon. 2/m
4.HE.40CavoiteCaV4+3O7Orth. mmm(2/m2/m2/m) : Pnma

Other InformationHide

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

Internet Links for BarianditeHide

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mindat.org URL:
https://www.mindat.org/min-522.html
Please feel free to link to this page.

References for BarianditeHide

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Localities for BarianditeHide

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Showing 7 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 👁 Image
symbol to view information about a locality. The 👁 Image
symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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👁 Image
- This locality has map coordinates listed. 👁 Image
- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. 👁 Image
- Good crystals or important locality for species. 👁 Image
- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Gabon (TL)
  • Haut-Ogooué Province
    • Léboumbi-Leyou Department
      • Mounana
Cesbron et al. (1971) +1 other reference
Germany
  • Baden-Württemberg
    • Freiburg Region
      • Ortenaukreis
        • Oberwolfach
Draxler et al. (05/2023)
Peru
  • Pasco
    • Pasco Province
      • Huayllay District
Bayliss et al. (1989) +1 other reference
USA
  • Colorado
    • Montrose County
Eckel et al. (1997)
  • Utah
    • Grand County
      • Thompsons Mining District
        • The Poison Strip
King (n.d.)
    • San Juan County
      • La Sal Creek Mining District
Canadian Mineralogist (2001) +1 other reference
      • La Sal Mining District
Quick NavTopAbout BarianditeUnique IdentifiersSimilar NamesIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesRelationshipsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
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To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
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