Francevillite
A valid IMA mineral species - grandfathered
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About Francevillite
Franceville, Gabon
Formula:
Ba(UO2)2(VO4)2 · 5H2O
Colour:
Lemon-yellow, yellow-orange, orange, greenish yellow, green, brown
Hardness:
3
Specific Gravity:
4.55
Crystal System:
Orthorhombic
Member of:
Name:
Named in 1957 by G. Branche, M.E. Ropert, F. Chantret, B. Morignat, and R. Pouget for Franceville, the city nearest the type locality.
Unique Identifiers
Mindat ID:
1589
Long-form identifier:
mindat:1:1:1589:5
GUID
(UUID V4):
(UUID V4):
69167a43-7aa6-4566-becf-3acad63b8d8e
IMA Classification of Francevillite
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1957
Classification of Francevillite
4.HB.15
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
B : Uranyl Sorovanodates
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
B : Uranyl Sorovanodates
40.2a.27.1
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2a : AB2(XO4)2·xH2O, containing (UO2)2+
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2a : AB2(XO4)2·xH2O, containing (UO2)2+
21.4.10
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 IMAâCNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Fvl | IMAâCNMNC | Warr, L.N. (2021). IMAâCNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Francevillite
Transparency:
Translucent
Colour:
Lemon-yellow, yellow-orange, orange, greenish yellow, green, brown
Streak:
Light yellow
Hardness:
3 on Mohs scale
Cleavage:
Perfect
On {001}
On {001}
Density:
4.55 g/cm3 (Measured) 4.56 g/cm3 (Calculated)
Optical Data of Francevillite
Type:
Biaxial (-)
RI values:
nα = 1.750 - 1.785 nβ = 1.910 - 1.952 nγ = 1.945 - 2.002
2V:
Measured: 52° , Calculated: 46° to 52°
Max Birefringence:
δ = 0.195 - 0.217
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
Dispersion:
strong
Optical Extinction:
X = c; Y = b; Z = a.
Pleochroism:
Visible
Comments:
X = colorless; Y = Z = yellow.
Chemistry of Francevillite
Mindat Formula:
Ba(UO2)2(VO4)2 · 5H2O
Crystallography of Francevillite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 10.419(1) Å, b = 8.510(1) Å, c = 16.763(2) Å
Ratio:
a:b:c = 1.224 : 1 : 1.97
Unit Cell V:
1,486.30 Ă
Âł (Calculated from Unit Cell)
Z:
4
Morphology:
Dominant {111}, rare {100}, {010}.
Comment:
Space Group: P can
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0014806 | Francevillite | Mereiter K (1986) Crystal structure refinement of two francevillites, (Ba,Pb)[(UO2)2V2O8]*5H2O Neues Jahrbuch fur Mineralogie, Monatshefte 1986 552-560 | 1986 | Mounana, near Franceville, Gabon | 0 | 293 | |
| 0014807 | Francevillite | Mereiter K (1986) Crystal structure refinement of two francevillites, (Ba,Pb)[(UO2)2V2O8]*5H2O Neues Jahrbuch fur Mineralogie, Monatshefte 1986 552-560 | 1986 | Mounana, near Franceville, Gabon | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
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Radiation - Copper Kα
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.30 Ă | (100) |
| 2.98 Ă | (80) |
| 4.17 Ă | (60) |
| 2.57 Ă | (60) |
| 2.10 Ă | (50) |
| 3.27 Ă | (40) |
| 2.01 Ă | (40) |
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] | |
| 47f : [Uranyl (Uâ¶âș) minerals] |
Type Occurrence of Francevillite
General Appearance of Type Material:
Impregnations, cryptocrystalline veinlets, and crystal-plates several millimeters in thickness.
Place of Conservation of Type Material:
National School of Mines, Paris, France.
The Natural History Museum, London, England, 1958,597.
The Natural History Museum, London, England, 1958,597.
Geological Setting of Type Material:
Sandstone
Associated Minerals at Type Locality:
Reference:
Branche, G., Ropert, M.E., Chantret, F., Morignat, B., Pouget, R. (1957) La francevillite, nouveau minĂ©ral uranifĂšre. Comptes Rendus Hebdomadaires des SĂ©ances de lâAcadĂ©mie des Sciences: 245: 89-91.
Synonyms of Francevillite
Other Language Names for Francevillite
Relationship of Francevillite to other Species
Member of:
Other Members of this group:
| Curienite | Pb(UO2)2(VO4)2 · 5H2O | Orth. mmm (2/m 2/m 2/m) |
| Finchite | Sr(UO2)2(V2O8) · 5H2O | Orth. mmm (2/m 2/m 2/m) |
| Fritzscheite | Mn(UO2)2(PO4,VO4)2 · 10H2O (?) | Tet. |
Chemically related to group(s):
| Carnotite Group | A group of metal-uranyl vanadates. |
Forms a series with:
Common Associates
Associated Minerals Based on Photo Data:
| 71 photos of Francevillite associated with Curienite | Pb(UO2)2(VO4)2 · 5H2O |
| 69 photos of Francevillite associated with Chervetite | Pb2(V2O7) |
| 49 photos of Francevillite associated with Mounanaite | PbFe3+2(VO4)2(OH,F)2 |
| 5 photos of Francevillite associated with Mottramite | PbCu(VO4)(OH) |
| 5 photos of Francevillite associated with Quartz | SiO2 |
| 5 photos of Francevillite associated with Carnotite | K2(UO2)2(VO4)2 · 3H2O |
| 3 photos of Francevillite associated with Pitchblende | UO2 |
| 3 photos of Francevillite associated with Pandoraite-Ba | BaV4+5V5+2O16 · 3H2O |
| 2 photos of Francevillite associated with Autunite | Ca(UO2)2(PO4)2 · 10-12H2O |
| 2 photos of Francevillite associated with Unnamed (Ba-Fe Vanadate) | Ba, Fe, V, O, H |
Related Minerals - Strunz-mindat Grouping
| 4.HB.05 | Carnotite | K2(UO2)2(VO4)2 · 3H2O |
| 4.HB.05 | Margaritasite | (Cs,K,H3O)2(UO2)2(VO4)2 · H2O |
| 4.HB.10 | Sengierite | Cu2(UO2)2(VO4)2 · 6H2O |
| 4.HB.15 | Curienite | Pb(UO2)2(VO4)2 · 5H2O |
| 4.HB.15 | Fritzscheite | Mn(UO2)2(PO4,VO4)2 · 10H2O (?) |
| 4.HB.15 | Finchite | Sr(UO2)2(V2O8) · 5H2O |
| 4.HB.20 | Metavanuralite | Al(UO2)2(VO4)2(OH) · 8H2O |
| 4.HB.20 | Vanuralite | Al(UO2)2(V2O8)(OH) · 11H2O |
| 4.HB.25 | Metatyuyamunite | Ca(UO2)2(VO4)2 · 3H2O |
| 4.HB.25 | Tyuyamunite | Ca(UO2)2(VO4)2 · 5-8H2O |
| 4.HB.30 | Strelkinite | Na2(UO2)2(VO4)2 · 6H2O |
| 4.HB.35 | Uvanite | U6+2V5+6O21 · 15H2O (?) |
| 4.HB.40 | Rauvite | Ca(UO2)2(V10O28) · 16H2O |
| 4.HB.45 | Vandermeerscheite | K2[(UO2)2V2O8] · 2H2O |
Fluorescence of Francevillite
Does not fluoresce.
Other Information
Thermal Behaviour:
The mineral loses 7.8% H2O up to 225° and 8.7% up to 520°, but heating for three hours at 225° drove off 8.6%. X-ray patterns of material heated at 520° show no change, and the mineral rehydrates on being allowed to stand in the room atmosphere. A DTA curve shows a large endothermal effect at about 150-200°, and smaller ones at 680° and 900°.
Notes:
Radioactive
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 Francevillite
mindat.org URL:
https://www.mindat.org/min-1589.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Francevillite
Localities for Francevillite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
â - 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.
Australia | |
| Henry et al. (2005) |
| |
Canada | |
| Rose (1973) |
| SASSANO et al. (1987) |
China | |
| National Geological Archives of China ... |
Czech Republic | |
| PauliĆĄ |
| Sejkora et al. (2019) |
DR Congo | |
| Deliens +1 other reference |
| Gauthier et al. (1989) |
| Wilson (2018) |
France | |
| Cuchet et al. (2000) |
| J.-J. Périchaud: "Les Minéraux ... |
| H. Agrinier and J. Geffroy : "Les Minéraux Séléniés du Point UranifÚre de Liauzun-en-Olloix (Puy de DÎme) |
| Wittern et al. (Cologne) +1 other reference |
| - (1998) |
| - (1998) |
| - (1998) |
Gabon | |
| |
| Branche et al. (1957) +1 other reference |
| Janusz Janeczek (1999) | |
Germany | |
| 90 +5 other references |
| |
| Wittern (2001) |
| WeiĂ (1990) |
| Gröbner et al. (2007) +1 other reference |
Italy | |
| Campostrini I. (2013) |
Kazakhstan | |
| Pavel.M. Kartashov (n.d.) |
Mauritania | |
| Marsh et al. (2015) |
| Marsh et al. (2015) | |
| Marsh et al. (2015) |
Morocco | |
| W.Paar (1974) |
Niger | |
| J. P. le Roux and P. D. Toens (1987) |
Russia | |
| Pavel.M. Kartashov (n.d.) |
| Pavel.M. Kartashov (n.d.) |
Slovenia | |
| Dolenec (1985) |
South Korea | |
| Cheong et al. (2003) |
Spain | |
| Joan Abella i Creus specimen |
| Calvo (2009) |
UK | |
| Embrey (1978) +1 other reference |
USA | |
| Anita Moore-Nall and David R. Lageson (2015) |
| Anita Moore-Nall and David R. Lageson (2015) | |
| |
| Peter Chin |
| |
Zimbabwe | |
| Gallagher M. J. (1966) |
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Mounana Mine, Mounana, Léboumbi-Leyou Department, Haut-Ogooué Province, Gabon