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Walfordite

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Formula:
(Fe3+,Te6+)Te34+O8
System:
Isometric
Colour:
Orange
Lustre:
Adamantine
Name:
Named by Malcolm E. Back, Joel D. Grice, Robert A. Gault, A. J. Criddle, and Joseph A. Mandarino in 1999 in honor of Phillip Walford [b. 1945], of Toronto, Ontario, Canada, Vice-President and Chief Geologist of LAC Minerals, Ltd., at the time that mining company held the mining rights to the discovery locality. He collected the first specimens.
This page provides mineralogical data about Walfordite.


Classification of Walfordite

Approved
First Published:
1999
4.JK.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
K : Tellurites without additional anions, without H2O

Physical Properties of Walfordite

Adamantine
Diaphaneity (Transparency):
Opaque
Colour:
Orange
Streak:
Orange-yellow
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
None observed
Density:
5.84 g/cm3 (Calculated)

Optical Data of Walfordite

Type:
Isotropic
Bireflectance:
None
Pleochroism:
Non-pleochroic

Chemical Properties of Walfordite

Formula:
(Fe3+,Te6+)Te34+O8
IMA Formula:
(Fe3+,Te6+,Ti4+,Mg)Te34+O8
Elements listed in formula:

Crystallography of Walfordite

Crystal System:
Isometric
Class (H-M):
m3 (2/m 3) - Diploidal
Space Group:
Ia3
Space Group Setting:
Ia3
Cell Parameters:
a = 11.011 Å
Unit Cell Volume:
V 1,335.00 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Most are simple cubes {100}. Some show octahedral modifications {111}.
X-Ray Powder Diffraction Data:
d-spacingIntensity
3.175 (100)
1.658 (45)
1.944 (44)
2.749 (37)
4.486 (29)
2.943 (23)
2.592 (22)

Type Occurrence of Walfordite

Place of Conservation of Type Material:
Royal Ontario Museum, Toronto, Canada, M47817, M47818.
Associated Minerals at Type Locality:

Relationship of Walfordite to other Species

4.JK.05WinstanleyiteTiTe34+O8
4.JK.10SpiroffiteMn22+Te34+O8
4.JK.10ZincospiroffiteZn2Te34+O8
4.JK.15BalyakiniteCu(TeO3)
4.JK.20RajiteCu(Te24+O5)
4.JK.25CarlfriesiteCaTe24+Te6+O8
4.JK.30Denningite(Mn2+,Ca,Zn)Te24+O5
4.JK.35ChekhovichiteBi2Te44+O11
4.JK.40SmirniteBi2Te4+O5
4.JK.45Choloalite(Cu,Sb)3(Pb,Ca)3(TeO3)6Cl
4.JK.50FairbankitePb(TeO3)
4.JK.55PlumbotelluritePb(TeO3)
4.JK.60Magnolite(Hg2+)(Te4+O3)
4.JK.65MoctezumitePb(UO2)(TeO3)2
4.JK.70Schmitterite(UO2)(TeO3)
4.JK.75Cliffordite(UO2)Te34+O7

Other Names for Walfordite

Name in Other Languages:

Other Information

No fluorescence in short- or long-wavelength ultraviolet light.
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 Walfordite

Reference List:
Galy, J., Meunier, G. (1971) Sur une déformation inédite du réseau de type fluorine. structure cristalline des phases MTe3O8 (M=Ti, Sn, Hf, Zr). Acta Crystallographica: B27: 602-608.

Back, M.E., Grice, J.D., Gault, R.A., Criddle, A.J., Mandarino, J.A. (1999) Walfordite, a new tellurite species from the Wendy open pit, El Indio-Tambo mining property, Chile. The Canadian Mineralogist: 37: 1261-1268.

Jambor, J.L., Pertsev, N.N., Roberts, A.C. (2000) New mineral names. American Mineralogist: 85: 1321-1325.

Internet Links for Walfordite

mindat.org URL:
https://www.mindat.org/min-7360.html
Please feel free to link to this page.

Localities for Walfordite

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Chile (TL)
 
  • Coquimbo Region
    • Elqui Province
      • El Indio deposit
        • Tambo Mine
Back, M.E., Grice, J.D., Gault, R.A., Criddle, A.J. & Mandarino, J.A. (1999): Walfordite, a new tellurite from the Wendy open pit, El Indio - Tambo mining property, Chile. Canadian Mineralogist 37, 1261-1268.
Mineral and/or Locality  
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