Walfordite
A valid IMA mineral species
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About Walfordite
Phillip C. Walford interview photo
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. Phillip C. Walford was the President and Chief Executive Officer of Marathon Gold from December 2009 to August 2019. From March 2005 to November 2010 Mr. Walford served as the President and Chief Executive Officer of Marathon PGM Corporation. Mr. Walford was also a founder of Marathon PGM Corporation and served as a director from October 2003 to November 2006 and from May 2007 to November 2010. Mr. Walford has held senior management positions at Pamour Porcupine Mines Ltd., LacMinerals Ltd. Geomaque Explorations Ltd., and Hudson Bay Exploration and Development and has extensive international experience in gold and base metal deposits.
This page provides mineralogical data about Walfordite.
Unique Identifiers
Mindat ID:
7360
Long-form identifier:
mindat:1:1:7360:4
IMA Classification of Walfordite
Classification of Walfordite
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
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 |
|---|---|---|
| Wfd | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Walfordite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon 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
Chemistry of Walfordite
Mindat Formula:
(Fe3+,Te6+)Te4+3O8
Element Weights:
Elements listed:
Crystallography of Walfordite
Crystal System:
Isometric
Class (H-M):
m3(2/m3) - 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 crystals are simple cubes {100}. Some show octahedral modifications {111}.
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) |
|---|---|---|---|---|---|---|---|
| 0005629 | Walfordite | Back M E, Grice J D, Gault R A, Criddle A J, Mandarino J A (1999) Walforite, a new tellurite species from the Wendy Open Pit, El Indio-Tambo Mining Property, Chile The Canadian Mineralogist 37 1261-1268 |  | 1999 | Wendy Open Pit, El Indio-Tambo Mining Property, Chile | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.495 Å | (25) |
| 3.893 Å | (2) |
| 3.179 Å | (100) |
| 2.943 Å | (11) |
| 2.753 Å | (32) |
| 2.595 Å | (14) |
| 2.462 Å | (5) |
| 2.159 Å | (6) |
| 2.010 Å | (3) |
| 1.658 Å | (45) |
| 1.947 Å | (28) |
| 1.888 Å | (6) |
| 1.786 Å | (4) |
| 1.741 Å | (3) |
| 1.699 Å | (2) |
| 1.699 Å | (3) |
| 1.660 Å | (24) |
| 1.624 Å | (3) |
| 1.589 Å | (5) |
| 1.557 Å | (3) |
| 1.527 Å | (1) |
| 1.498 Å | (2) |
| 1.471 Å | (2) |
| 1.398 Å | (3) |
| 1.376 Å | (2) |
| 1.355 Å | (2) |
| 1.316 Å | (2) |
| 1.298 Å | (1) |
| 1.280 Å | (1) |
| 1.263 Å | (3) |
| 1.231 Å | (2) |
| 1.231 Å | (2) |
| 1.201 Å | (2) |
| 1.123 Å | (1) |
| 1.101 Å | (1) |
Comments:
Downs et al. (1993) American Mineralogist 78, 1104-1107.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47e : [Vanadates, chromates, manganates] | |
| 47h : [Near-surface oxidized, dehydrated minerals] |
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
Associations Based on Photo Data:
| 3 photos of Walfordite associated with Native Gold | Au |
| 2 photos of Walfordite associated with Alunite | KAl3(SO4)2(OH)6 |
| 1 photo of Walfordite associated with Rodalquilarite | Fe2(TeO2OH)3(TeO3)Cl |
| 1 photo of Walfordite associated with Jarosite | KFe3+3(SO4)2(OH)6 |
Related Minerals - Strunz-mindat Grouping
| 4.JK. | Matthiasweilite | PbTe4+O3 |
| 4.JK.05 | Winstanleyite | TiTe4+3O8 |
| 4.JK.10 | Zincospiroffite | Zn2Te4+3O8 |
| 4.JK.10 | Spiroffite | Mn2+2Te4+3O8 |
| 4.JK.15 | Balyakinite | Cu(TeO3) |
| 4.JK.20 | Rajite | Cu(Te4+2O5) |
| 4.JK.25 | Carlfriesite | CaTe4+2Te6+O8 |
| 4.JK.30 | Chenzhangruite | MnFe2+Te4+4O10 |
| 4.JK.30 | Stankeithite | Mn2+Mn2+Te4+4 O10 |
| 4.JK.30 | Paulhlavaite | CaCuTe4+ 4O10 |
| 4.JK.30 | Denningite | CaMn2+Te4+4O10 |
| 4.JK.35 | Chekhovichite | Bi2Te4+4O11 |
| 4.JK.40 | Smirnite | Bi2Te4+O5 |
| 4.JK.45 | Choloalite | (Cu,Sb)3(Pb,Ca)3(TeO3)6Cl |
| 4.JK.50 | Fairbankite | Pb2+12(Te4+O3)11(SO4) |
| 4.JK.55 | Plumbotellurite | Pb(TeO3) |
| 4.JK.60 | Magnolite | [Hg2]2+[Te4+O3] |
| 4.JK.65 | Moctezumite | Pb(UO2)(TeO3)2 |
| 4.JK.70 | Schmitterite | (UO2)(TeO3) |
| 4.JK.75 | Cliffordite | (UO2)Te4+3O7 |
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.
Internet Links for Walfordite
mindat.org URL:
https://www.mindat.org/min-7360.html
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References for Walfordite
Reference List:
Meunier, G.; Galy, J. (1971) Sur une déformation inédite du reseau de type fluorine. Structure cristalline des phases MTe3O8 (M = Ti, Sn, Hf, Zr). Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry, 27 (3). 602-608 doi:10.1107/s0567740871002620
Localities for Walfordite
Showing 2 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.
Chile (TL) | |
| Back et al. (1999) |
Spain | |
| ... |
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Filón 450, Rodalquilar, Níjar, Almería, Andalusia, Spain