Bariandite
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
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
GUID
(UUID V4):
(UUID V4):
f5557042-145a-4bc5-a28d-4977b2cf0b97
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 |
---|---|---|
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
Max Birefringence:
δ = 0.000
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
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 Bariandite
Mindat Formula:
Al0.6(V5+,V4+)8O20 · 9H2O
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) |
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:
Reference:
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).
Synonyms of Bariandite
Other Language Names for Bariandite
Relationship of Bariandite to other Species
Member of:
Other Members of this 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
Associated Minerals Based on Photo Data:
4 photos of Bariandite associated with Roscoelite | K(V3+,Al)2(AlSi3O10)(OH)2 |
3 photos of Bariandite associated with Lenoblite | V4+2O4 · 2H2O |
3 photos of Bariandite associated with Gypsum | CaSO4 · 2H2O |
3 photos of Bariandite associated with Pascoite | Ca2Ca(V10O28) · 17H2O |
3 photos of Bariandite associated with Hewettite | CaV6O16 · 9H2O |
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 |
1 photo of Bariandite associated with Duttonite | V4+O(OH)2 |
1 photo of Bariandite associated with Mounanaite | PbFe3+2(VO4)2(OH,F)2 |
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 | Bokite | (Al,Fe)1.3(V5+,V4+,Fe3+)8O20 · 7.5H2O |
4.HE.20 | Corvusite | (Na,K,Ca,Mg)2(V5+,V4+,Fe2+)8O20 · 6-10H2O |
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
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Bariandite
Localities for Bariandite
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).
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.
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.) |
| Min Rec 33:4 pp351-355 +1 other reference |
|
Quick NavTopAbout BarianditeUnique IdentifiersIMA 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