Favreauite
A valid IMA mineral species
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About Favreauite
Georges Favreau
Formula:
PbBiCu6O4(SeO3)4(OH) · H2O
Colour:
Green
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
4.851 (Calculated)
Crystal System:
Tetragonal
Name:
Named for Georges Favreau, amateur mineralogist and professional engineer, France, in recognition of his work on rare minerals and French mineral deposits; he was the President of the Association Française de Microminéralogie (1993-2007).
Unique combination of elements. Also unique structure, although similar to that of nabokoite and atlasovite (all 3 species have structures derived from that of murdochite by selective deletion of atoms).
Structure details: (1) corrugated layer of CuO4 squares (2) SeO3 triangular pyramids decorating the squares; (3) O atoms in the sheet coordinated to 3 Cu atoms; (4) Pb, Bi, OH, and water in structural voids; (5) Cu has two additional long bonds to interlayer OH and water, thus forming Jahn-Teller elongated octahedra; (6) Bi resides in hollows in each Cu–O sheet; (7) Pb atoms connect successive sheets; (8) Bi and Pb are both in distorted cubic coordination; the Bi site has point symmetry 4; the Pb site has point symmetry 4.
Structure details: (1) corrugated layer of CuO4 squares (2) SeO3 triangular pyramids decorating the squares; (3) O atoms in the sheet coordinated to 3 Cu atoms; (4) Pb, Bi, OH, and water in structural voids; (5) Cu has two additional long bonds to interlayer OH and water, thus forming Jahn-Teller elongated octahedra; (6) Bi resides in hollows in each Cu–O sheet; (7) Pb atoms connect successive sheets; (8) Bi and Pb are both in distorted cubic coordination; the Bi site has point symmetry 4; the Pb site has point symmetry 4.
Unique Identifiers
Mindat ID:
45907
Long-form identifier:
mindat:1:1:45907:1
IMA Classification of Favreauite
Approved
IMA Formula:
Pb2+Bi3+Cu2+6O4(Se4+O3)4(OH)·H2O
Approval year:
2014
First published:
2014
Type description reference:
Classification of Favreauite
4.JJ.30
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
J : Selenites with additional anions, with H2O
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
J : Selenites with additional anions, with H2O
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 |
|---|---|---|
| Fav | 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 Favreauite
Vitreous
Transparency:
Transparent
Comment:
Calculated estimate for RI suggests at least subadamantine rather than vitreous
Colour:
Green
Hardness:
3 on Mohs scale
Hardness Data:
Estimated
Tenacity:
Brittle
Cleavage:
Perfect
{001} basal cleavage.
{001} basal cleavage.
Fracture:
Irregular/Uneven
Density:
4.851 g/cm3 (Calculated)
Comment:
Couldn't be measured
Optical Data of Favreauite
Type:
Uniaxial (-)
Pleochroism:
Visible
Comments:
shades of green (O < E)
Comments:
Mean RI calculated from Gladstone-Dale relationship = 1.854
Chemistry of Favreauite
Mindat Formula:
PbBiCu6O4(SeO3)4(OH) · H2O
Element Weights:
Common Impurities:
Ca
Crystallography of Favreauite
Crystal System:
Tetragonal
Class (H-M):
4/m - Dipyramidal
Space Group:
P4/n
Cell Parameters:
a = 9.860(4) Å, c = 9.700(5) Å
Ratio:
a:c = 1 : 0.984
Unit Cell V:
943.03 ų (Calculated from Unit Cell)
Morphology:
Tabular crystals, flattened on {001}.
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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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) |
|---|---|---|---|---|---|---|---|
| 0020444 | Favreauite | Mills S J, Kampf A R, Christy A G, Housley R M, Thorne B, Chen Y S, Steele I M (2014) Favreauite, a new selenite mineral from the El Dragon mine, Bolivia European Journal of Mineralogy 26 771-781 | 2014 | El Dragon mine, Potosi Department, Bolivia | 0 | 100 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.67 Å | (100) |
| 3.470 Å | (76) |
| 3.190 Å | (35) |
| 2.961 Å | (40) |
| 2.831 Å | (68) |
| 2.709 Å | (33) |
| 2.632 Å | (34) |
| 2.247 Å | (36) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] |
Type Occurrence of Favreauite
General Appearance of Type Material:
Tiny square tabular crystals, up to 0.1 × 0.01 mm, flattened on {001}, occurring in subparallel and divergent groups.
Place of Conservation of Type Material:
Cotype material is deposited in the collections of the Museum Victoria, Australia, registration number M53004 and the Natural History Museum of Los Angeles County, Los Angeles, USA, catalogue numbers 64111, 64112, 64113.
Geological Setting of Type Material:
Vugs in a matrix; secondary mineral formed due to oxidation of the selenide vein within sandstones and shales.
Associated Minerals at Type Locality:
Synonyms of Favreauite
Other Language Names for Favreauite
Common Associates
Associations Based on Photo Data:
| 26 photos of Favreauite associated with Goethite | Fe3+O(OH) |
| 17 photos of Favreauite associated with Clausthalite | PbSe |
| 11 photos of Favreauite associated with Chalcomenite | CuSeO3 · 2H2O |
| 8 photos of Favreauite associated with Kruťaite | CuSe2 |
| 7 photos of Favreauite associated with Chalcopyrite | CuFeS2 |
| 7 photos of Favreauite associated with Luxembourgite | AgCuPbBi4Se8 |
| 5 photos of Favreauite associated with Athabascaite | Cu5Se4 |
| 4 photos of Favreauite associated with Watkinsonite | Cu2PbBi4(Se,S,Te)8 |
| 4 photos of Favreauite associated with Quartz | SiO2 |
| 3 photos of Favreauite associated with Vaesite | NiS2 |
Related Minerals - Strunz-mindat Grouping
| 4.JJ. | Kristekite | Cu2(H2O)4(UO2)(SeO3)3 · 4H2O |
| 4.JJ.X | Larisaite | Na(H3O)(UO2)3(SeO3)O2 · 4H2O |
| 4.JJ. | Borzęckiite | Pb(UO2)3(SeO3)2O2 · 3H2O |
| 4.JJ. | Petermegawite | Al6(Se4+O3)3[SiO3(OH)](OH)9 · 10H2O |
| 4.JJ. | Amurselite | (NH4)2(UO2)5(SeO3)3O2(OH)2(H2O) · 8H2O |
| 4.JJ.05 | Marthozite | Cu2+(UO2)3(SeO3)2O2 · 8H2O |
| 4.JJ.10 | Guilleminite | Ba(UO2)3(SeO3)2O2 · 3H2O |
| 4.JJ.15 | Piretite | Ca(UO2)3(SeO3)2(OH)4 · 4H2O |
| 4.JJ.20 | Demesmaekerite | Pb2Cu5(UO2)2(SeO3)6(OH)6 · 2H2O |
| 4.JJ.25 | Haynesite | (UO2)3(Se4+O3)2(OH)2 · 5H2O |
Other Information
Notes:
Raman bands [cm-1]: 847 (ν1 SeO3 stretching); 764, 795 (ν3 SeO3 antisymmetric stetching), 493, 542 (ν2 SeO3 bending), 320, 392 (ν4 SeO3 bending); 3525b (O–H stretching)
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 Favreauite
mindat.org URL:
https://www.mindat.org/min-45907.html
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References for Favreauite
Reference List:
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2014) New minerals and nomenclature modifications approved in 2014, CNMNC Newsletter No 20. Mineralogical Magazine, 78 (3) 549-558 doi:10.1180/minmag.2014.078.3.05
Localities for Favreauite
Showing 1 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.
Bolivia (TL) | |
| Mills et al. (2014) +2 other references |
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El Dragón mine, Porco Municipality, Antonio Quijarro Province, Potosí, Bolivia