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Favreauite

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About FavreauiteHide

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.


Classification of FavreauiteHide

Approved
Approval Year:
2014

Physical Properties of FavreauiteHide

Vitreous
Transparency:
Transparent
Comment:
calculated estimate for RI suggests at least subadamantine rather than vitreous
Colour:
green
Hardness:
Hardness Data:
Estimated
Cleavage:
Perfect
{001} basal cleavage
Fracture:
Irregular/Uneven
Density:
4.851 g/cm3 (Calculated)
Comment:
couldn't be measured

Optical Data of FavreauiteHide

Type:
Uniaxial (-)
Pleochroism:
Visible
Comments:
shades of green (O < E)
Comments:
Mean RI calculated from Gladstone-Dale relationship = 1.854

Chemical Properties of FavreauiteHide

Formula:
PbBiCu6O4(SeO3)4(OH) · H2O
Common Impurities:
Ca

Crystallography of FavreauiteHide

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}

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
5.67(100)
3.470(76)
3.190(35)
2.961(40)
2.831(68)
2.709(33)
2.632(34)
2.247(36)

Type Occurrence of FavreauiteHide

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 FavreauiteHide

Other Language Names for FavreauiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Schmiederite1 photo of Favreauite associated with Schmiederite on mindat.org.

Other InformationHide

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.

References for FavreauiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Mills, S.J. (2014): Un hommage à la contribution de Georges FAVREAU à la minéralogie: favreauite, un nouveau minéral de la mine El Dragón, Bolivie. Cahier des Micromonteurs 124, 36-39.
Mills, S.J., Kampf, A.R., Housley, R.M., Christy, A.G., Thorne, B., Chen, Y.-S. and Steele, I.M. (2014) Favreauite, IMA 2014-013. CNMNC Newsletter No. 20, June 2014, page 557; Mineralogical Magazine, 78, 549-558.
Mills, S.J., Kampf, A.R., Housley, R.M., Christy, A.G., Thorne, B., Chen, Y.-S. and Steele, I.M. (2014) Favreauite, a new selenite mineral from the El Dragón mine, Bolivia. European Journal of Mineralogy, 26, 771-781.

Internet Links for FavreauiteHide

Localities for FavreauiteHide

ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Bolivia (TL)
 
  • Potosí
    • Antonio Quijarro Province
Mills, S.J. (2014): Un hommage à la contribution de Georges FAVREAU à la minéralogie: favreauite, un nouveau minéral de la mine El Dragón, Bolivie. Cahier des Micromonteurs 124, 36-39.
Mineral and/or Locality  
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