Walfordite
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About Walfordite
Formula:
(Fe3+,Te6+)Te4+3O8
Colour:
Orange
Lustre:
Adamantine
Specific Gravity:
5.84 (Calculated)
Crystal System:
Isometric
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/K.14-05
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
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
Pronounciation of Walfordite
Pronounciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon & Katya Ralph | United Kingdom |
Physical Properties of Walfordite
Adamantine
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+)Te4+3O8
IMA Formula:
(Fe3+,Te6+,Ti4+,Mg)Te4+3O8
Crystallography of Walfordite
Crystal System:
Isometric
Class (H-M):
m3 (2/m 3) - Diploidal
Space Group:
Ia3
Setting:
Ia3
Cell Parameters:
a = 11.011 Å
Unit Cell 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
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.175 Å | (100) |
| 1.658 Å | (45) |
| 1.944 Å | (44) |
| 2.749 Å | (37) |
| 4.486 Å | (29) |
| 2.943 Å | (23) |
| 2.592 Å | (22) |
Type Occurrence of Walfordite
Place of Conservation of Type Material:
Royal Ontario Museum, Toronto, Canada, M47817, M47818.
Associated Minerals at Type Locality:
Synonyms of Walfordite
Other Language Names for Walfordite
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Nickel-Strunz Grouping
| 4.JK.05 | Winstanleyite | TiTe4+3O8 | Iso. m3 (2/m 3) : Ia3 |
| 4.JK.10 | Spiroffite | Mn2+2Te4+3O8 | Mon. 2/m : B2/b |
| 4.JK.10 | Zincospiroffite | Zn2Te4+3O8 | Mon. 2/m |
| 4.JK.15 | Balyakinite | Cu(TeO3) | Orth. |
| 4.JK.20 | Rajite | Cu(Te4+2O5) | Mon. 2/m : P21/b |
| 4.JK.25 | Carlfriesite | CaTe4+2Te6+O8 | Mon. 2/m : B2/b |
| 4.JK.30 | Denningite | (Mn2+,Ca,Zn)Te4+2O5 | Tet. |
| 4.JK.35 | Chekhovichite | Bi2Te4+4O11 | Mon. 2/m |
| 4.JK.40 | Smirnite | Bi2Te4+O5 | Orth. mm2 |
| 4.JK.45 | Choloalite | (Cu,Sb)3(Pb,Ca)3(TeO3)6Cl | Iso. 4 3 2 : P41 3 2 |
| 4.JK.50 | Fairbankite | Pb(TeO3) | Tric. |
| 4.JK.55 | Plumbotellurite | Pb(TeO3) | Orth. |
| 4.JK.60 | Magnolite | (Hg+2)(Te4+O3) | Orth. mm2 |
| 4.JK.65 | Moctezumite | Pb(UO2)(TeO3)2 | Mon. |
| 4.JK.70 | Schmitterite | (UO2)(TeO3) | Orth. |
| 4.JK.75 | Cliffordite | (UO2)Te4+3O7 | Iso. m3 (2/m 3) : Pa3 |
Fluorescence of Walfordite
No fluorescence in short- or long-wavelength ultraviolet light.
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.
References for Walfordite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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
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Localities for Walfordite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - 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).
All localities listed without proper references should be considered as questionable.
Chile (TL) | |
| 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. |
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Wendy open pit, Tambo Mine, El Indio deposit, Elqui Province, Coquimbo, Chile