Bariandite
A valid IMA mineral species
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About Bariandite
Formula:
Al0.6(V5+,V4+)8O20 · 9H2O
Colour:
Black to dark green
Specific Gravity:
2.7
Crystal System:
Monoclinic
Member of:
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.
Unique Identifiers
Mindat ID:
522
Long-form identifier:
mindat:1:1:522:3
Similar Names
| Barrandite | A synonym |
IMA Classification of Bariandite
Approved
IMA Formula:
Al0.6(V5+,V4+)8O20·9H2O
Approval year:
1970
Classification of Bariandite
4.HE.20
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
E : Phyllovanadates
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
47 : VANADIUM OXYSALTS
3 : Hydrated Normal Vanadium Oxysalts
7.12.10
7 : Oxides and Hydroxides
12 : Oxides of V, Nb and Ta
7 : Oxides and Hydroxides
12 : Oxides of V, Nb and Ta
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Brd | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Bariandite
Transparency:
Opaque
Colour:
Black to dark green
Cleavage:
Perfect
on {001}
on {001}
Density:
2.7 g/cm3 (Measured) 2.50 g/cm3 (Calculated)
Optical Data of Bariandite
Type:
Biaxial
RI values:
n = 1.85
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
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 Bariandite
Mindat Formula:
Al0.6(V5+,V4+)8O20 · 9H2O
Element Weights:
Elements listed:
Crystallography of Bariandite
Crystal System:
Monoclinic
Cell Parameters:
a = 11.70(3) Å, b = 3.63(1) Å, c = 20.06(5) Å
β = 101.5°
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 Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 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) |
Reference:
Comments:
From type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest 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 Bariandite
Place of Conservation of Type Material:
National School of Mines, Paris, France;
The Natural History Museum, London, England (No. 1970,151)
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 Bariandite
Other Language Names for Bariandite
Relationship of Bariandite to other Species
Member of:
Other Members of Straczekite Group:
| Bokite | (Al,Fe)1.3(V5+,V4+,Fe3+)8O20 · 7.5H2O | Mon. |
| Corvusite | (Na,K,Ca,Mg)2(V5+,V4+,Fe2+)8O20 · 6-10H2O | Mon. 2/m : B2/m |
| Fernandinite | (Ca,K)(V5+,V4+,Fe2+)8O20 · 10H2O | Mon. 2/m : B2/m |
| Straczekite | (Ca,K,Ba)(V5+,V4+)8O20 · 3H2O | Mon. 2/m : B2/m |
Common Associates
Associations Based on Photo Data:
| 4 photos of Bariandite associated with Roscoelite | KV3+2(AlSi3O10)(OH)2 |
| 3 photos of Bariandite associated with Hewettite | CaV6O16 · 9H2O |
| 3 photos of Bariandite associated with Lenoblite | V4+2O4 · 2H2O |
| 3 photos of Bariandite associated with Patrónite | VS4 |
| 3 photos of Bariandite associated with Melanovanadite | Ca(V5+,V4+)4O10 · 5H2O |
| 3 photos of Bariandite associated with Pyrite | FeS2 |
| 3 photos of Bariandite associated with Gypsum | CaSO4 · 2H2O |
| 3 photos of Bariandite associated with Pascoite | Ca2Ca(V10O28) · 17H2O |
| 1 photo of Bariandite associated with Mounanaite | PbFe3+2(VO4)2(OH)2 |
| 1 photo of Bariandite associated with Francevillite | Ba(UO2)2(VO4)2 · 5H2O |
Related Minerals - Strunz-mindat Grouping
| 4.HE.05 | Melanovanadite | Ca(V5+,V4+)4O10 · 5H2O |
| 4.HE.10 | Shcherbinaite | V5+2O5 |
| 4.HE.15 | Hewettite | CaV6O16 · 9H2O |
| 4.HE.15 | Metahewettite | CaV6O16 · 3H2O |
| 4.HE.20 | Corvusite | (Na,K,Ca,Mg)2(V5+,V4+,Fe2+)8O20 · 6-10H2O |
| 4.HE.20 | Bokite | (Al,Fe)1.3(V5+,V4+,Fe3+)8O20 · 7.5H2O |
| 4.HE.20 | Fernandinite | (Ca,K)(V5+,V4+,Fe2+)8O20 · 10H2O |
| 4.HE.20 | Straczekite | (Ca,K,Ba)(V5+,V4+)8O20 · 3H2O |
| 4.HE.25 | Häggite | V3+V4+O2(OH)3 |
| 4.HE.30 | Doloresite | V4+3O4(OH)4 |
| 4.HE.35 | Duttonite | V4+O(OH)2 |
| 4.HE.40 | Cavoite | CaV4+3O7 |
Other Information
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 Bariandite
mindat.org URL:
https://www.mindat.org/min-522.html
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References for Bariandite
Reference List:
Cesbron, Fabien, Vachey, Hélène (1971) La bariandite, nouvel oxyde hydraté de vanadium (IV) et (V) Bulletin de Minéralogie, 94 (1) 49-54 doi:10.3406/bulmi.1971.6550[Abstract in Fleischer, M. (1972) New Mineral Names. American Mineralogist: 57(9-10): 1552-1562 (page 1555)].
Localities for Bariandite
Showing 7 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Gabon (TL) | |
| Cesbron et al. (1971) +1 other reference |
Germany | |
| Draxler et al. (05/2023) |
Peru | |
| Bayliss et al. (1989) +1 other reference |
USA | |
| Eckel et al. (1997) |
| King (n.d.) |
| Canadian Mineralogist (2001) +1 other reference |
|
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
Mounana Mine, Mounana, Léboumbi-Leyou Department, Haut-Ogooué Province, Gabon