Fervanite
A valid IMA mineral species - grandfathered
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About Fervanite
Formula:
Fe3+4V5+4O16 · 5H2O
Colour:
Golden brown, yellow-brown, pale green
Specific Gravity:
3.28
Crystal System:
Monoclinic
Name:
In allusion to its composition, containing both iron (Latin = FERrum) and VANadium.
This page provides mineralogical data about Fervanite.
Unique Identifiers
Mindat ID:
1541
Long-form identifier:
mindat:1:1:1541:3
Similar Names
| Ferganite | LiH[(UO2)4[VO4]2(OH)4 · 2H2O | |
| Ferganite (of Lebedev & Vakhrushev) | A rock subtype |
IMA Classification of Fervanite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Fe3+4V5+4O16·5H2O
First published:
1931
Classification of Fervanite
4.HG.05
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
G : Unclassified V oxides
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
G : Unclassified V oxides
47.3.4.1
47 : VANADIUM OXYSALTS
3 : Hydrated Normal Vanadium Oxysalts
47 : VANADIUM OXYSALTS
3 : Hydrated Normal Vanadium Oxysalts
21.4.23
21 : Vanadates (and vanadates with arsenate or phosphate)
4 : Vanadates of U, Mn, Fe or Ni
21 : Vanadates (and vanadates with arsenate or phosphate)
4 : Vanadates of U, Mn, Fe or Ni
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 |
|---|---|---|
| Fvn | 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 Fervanite
Transparency:
Transparent
Comment:
Lustre brilliant
Colour:
Golden brown, yellow-brown, pale green
Cleavage:
None Observed
Density:
3.28 g/cm3 (Measured)
Optical Data of Fervanite
Type:
Biaxial (-)
RI values:
nα = 2.186 nβ = 2.222 nγ = 2.224
2V:
Calculated: 26°
Max. Birefringence:
δ = 0.038
Based on recorded range of RI values above.
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. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
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. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Dispersion:
relatively strong
Optical Extinction:
Extinction slightly inclined to the length of the fibers.
Chemistry of Fervanite
Mindat Formula:
Fe3+4V5+4O16 · 5H2O
Element Weights:
Elements listed:
Crystallography of Fervanite
Crystal System:
Monoclinic
Cell Parameters:
a = 9.02 Å, c = 6.65 Å
β = 103.33°
β = 103.33°
Ratio:
a:c = 1 : 0.737
Unit Cell V:
0.00 ų (Calculated from Unit Cell)
Morphology:
Crystals fibrous, elongated [001] and flattened {010}; parallel aggregates.
Comment:
Crystal system "probable."
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.79 Å | (FFF) |
| 6.45 Å | (FF) |
| 3.22 Å | (F) |
| 3.15 Å | (mF) |
| 2.99 Å | (mf) |
| 2.93 Å | (mf) |
| 3.29 Å | (ff) |
Comments:
Mounana mine, Gabon
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47e : [Vanadates, chromates, manganates] | |
| 47h : [Near-surface oxidized, dehydrated minerals] |
Type Occurrence of Fervanite
Co-Type Localities:
General Appearance of Type Material:
Impregnations. Parallel fibers to 0.5 cm in length.
Place of Conservation of Type Material:
Harvard University, Cambridge, Massachusetts, USA: #91457. U.S. National Museum of Natural History, Washington, D.C., USA: #96420, 96421, & 97874.
Geological Setting of Type Material:
Sandstone
Associated Minerals at Type Locality:
Other Language Names for Fervanite
Common Associates
Associations Based on Photo Data:
| 18 photos of Fervanite associated with Kazakhstanite | Fe3+5V4+3V5+12O39(OH)9 · 9H2O |
| 18 photos of Fervanite associated with Schubnelite | Fe3+VO4 · H2O |
| 14 photos of Fervanite associated with Opal | SiO2 · nH2O |
| 7 photos of Fervanite associated with Tyuyamunite | Ca(UO2)2(VO4)2 · 5-8H2O |
| 2 photos of Fervanite associated with Corvusite | (Na,K,Ca,Mg)2(V5+,V4+,Fe2+)8O20 · 6-10H2O |
| 2 photos of Fervanite associated with Hewettite | CaV6O16 · 9H2O |
| 1 photo of Fervanite associated with Bokite | (Al,Fe)1.3(V5+,V4+,Fe3+)8O20 · 7.5H2O |
| 1 photo of Fervanite associated with Rauvite | Ca(UO2)2(V10O28) · 16H2O |
| 1 photo of Fervanite associated with Steigerite | Al(VO4) · 3H2O |
Related Minerals - Strunz-mindat Grouping
| 4.HG. | Calciodelrioite | Ca(VO3)2 · 4H2O |
| 4.HG. | Trebiskyite | Na3Mg2[TiV9O28] · 22H2O |
| 4.HG. | Cadvanite | Cd(VO3)2 |
| 4.HG.10 | Huemulite | Na4Mg(V10O28) · 24H2O |
| 4.HG.15 | Vanalite | NaAl9V12O42(OH)4 · 33H2O |
| 4.HG.20 | Simplotite | CaV4+4O9 · 5H2O |
| 4.HG.25 | Vanoxite | V4+4V5+2O13 · 8H2O |
| 4.HG.30 | Navajoite | Fe3+V5+9O24 · 12H2O |
| 4.HG.35 | Delrioite | Sr(VO3)2 · 4H2O |
| 4.HG.40 | Metadelrioite | CaSr(V2O6)(OH)2 |
| 4.HG.45 | Barnesite | (Na,Ca)V6O16 · 3H2O |
| 4.HG.50 | Hendersonite | (Ca,Sr)1.3V6O16 · 6H2O |
| 4.HG.55 | Grantsite | (Na,Ca)2+x(V5+,V4+)6O16 · 4H2O |
| 4.HG.60 | Lenoblite | V4+2O4 · 2H2O |
| 4.HG.65 | Satpaevite | Al12V4+2V5+6O37 · 30H2O |
| 4.HG.70 | Pandoraite-Ba | BaV4+5V5+2O16 · 3H2O |
| 4.HG.70 | Pandoraite-Ca | CaV4+5V5+2O16 · 3H2O |
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 Fervanite
mindat.org URL:
https://www.mindat.org/min-1541.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Fervanite
Reference List:
Hess, Frank L., Henderson, E. P. (1931) Fervanite, a hydrous ferric vanadate. American Mineralogist, 16 (7) 273-277
Ross, Malcolm (1959) Mineralogical applications of electron diffraction. II. Studies of some vanadium minerals of the Colorado Plateau. American Mineralogist, 44 (3-4) 322-341
Cesbron, Fabien (1970) La schubnélite, nouveau vanadate de fer hydraté. Bulletin de Minéralogie, 93 (4) 470-475 doi:10.3406/bulmi.1970.6495
Localities for Fervanite
Showing 15 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.
China | |
| Christian Rewitzer collection |
Gabon | |
| Cesbron (1970) |
Spain | |
| Dill et al. (2023) |
USA | |
| Haynes (1991) +1 other reference |
| Howard +3 other references |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Specimen ex. Pequa Rare Minerals - ... | |
| Hess et al. (1931) +1 other reference |
| Henderson (1935) | |
| Eckel et al. (1997) |
| Newmont Mining Corporation |
| Jensen et al. (1995) |
| Bullock (1981) |
| Hess et al. (1931) +2 other references |
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Monument No. 2 Mine, Monument No. 2 channel, Yazzie Mesa, Cane Valley Mining District, Apache County, Arizona, USA