Walfordite

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Walfordite

Wendy open pit, Tambo Mine, El Indio deposit, Elqui Province, Coquimbo, Chile

Walfordite

Wendy open pit, Tambo Mine, El Indio deposit, Elqui Province, Coquimbo, Chile

Walfordite

Wendy open pit, Tambo Mine, El Indio deposit, Elqui Province, Coquimbo, Chile

Walfordite

Wendy open pit, Tambo Mine, El Indio deposit, Elqui Province, Coquimbo, Chile

Walfordite

Wendy open pit, Tambo Mine, El Indio deposit, Elqui Province, Coquimbo, Chile

Walfordite

Wendy open pit, Tambo Mine, El Indio deposit, Elqui Province, Coquimbo, Chile

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About WalforditeHide

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.

Type Locality:

ⓘ Wendy open pit (Wendy pit), Tambo Mine, El Indio deposit, Elqui Province, Coquimbo, Chile

This page provides mineralogical data about Walfordite.

Classification of WalforditeHide

IMA status:

Approved

First Published:

1999

Strunz 8th ed.:

4/K.14-05

Nickel-Strunz 10th (pending) ed.:

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

Pronounciation of WalforditeHide

Pronounciation:

Play	Recorded by	Country
	Jolyon & Katya Ralph	United Kingdom

Physical Properties of WalforditeHide

Lustre:

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 WalforditeHide

Type:

Isotropic

Bireflectance:

None

Pleochroism:

Non-pleochroic

Chemical Properties of WalforditeHide

Formula:

(Fe³⁺,Te⁶⁺)Te⁴⁺₃O₈

IMA Formula:

(Fe³⁺,Te⁶⁺,Ti⁴⁺,Mg)Te⁴⁺₃O₈

Elements listed:

Fe, O, Te - search for minerals with similar chemistry

Crystallography of WalforditeHide

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 Å³ (Calculated from Unit Cell)

Morphology:

Most crystals are simple cubes {100}. Some show octahedral modifications {111}.

Crystal StructureHide

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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

data_global
_chemical_name_mineral 'Walfordite'
loop_
_publ_author_name
'Back M E'
'Grice J D'
'Gault R A'
'Criddle A J'
'Mandarino J A'
_journal_name_full 'The Canadian Mineralogist'
_journal_volume 37 
_journal_year 1999
_journal_page_first 1261
_journal_page_last 1268
_publ_section_title
;
 Walforite, a new tellurite species from the Wendy Open Pit, El Indio-Tambo
 Mining Property, Chile
;
_database_code_amcsd 0005629
_chemical_compound_source 'Wendy Open Pit, El Indio-Tambo Mining Property, Chile'
_chemical_formula_sum 'Fe.59 Te3.28 Ti.08 Mg.05 O8'
_cell_length_a 11.011
_cell_length_b 11.011
_cell_length_c 11.011
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 1334.997
_exptl_crystal_density_diffrn      5.816
_symmetry_space_group_name_H-M 'I 21/a -3'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,1/2+z'
  '1/2+z,x,1/2-y'
  '+z,1/2+x,-y'
  '1/2+z,-x,y'
  '+z,1/2-x,1/2+y'
  '-z,x,1/2+y'
  '1/2-z,1/2+x,+y'
  '-z,-x,-y'
  '1/2-z,1/2-x,1/2-y'
  '1/2+y,1/2-z,-x'
  '+y,-z,1/2-x'
  '-y,1/2-z,x'
  '1/2-y,-z,1/2+x'
  '1/2-y,z,-x'
  '-y,1/2+z,1/2-x'
  'y,z,x'
  '1/2+y,1/2+z,1/2+x'
  'x,1/2-y,1/2+z'
  '1/2+x,-y,+z'
  '-x,y,1/2+z'
  '1/2-x,1/2+y,+z'
  'x,1/2+y,-z'
  '1/2+x,+y,1/2-z'
  '-x,-y,-z'
  '1/2-x,1/2-y,1/2-z'
  '1/2-z,-x,1/2+y'
  '-z,1/2-x,+y'
  '1/2-z,x,-y'
  '-z,1/2+x,1/2-y'
  'z,-x,1/2-y'
  '1/2+z,1/2-x,-y'
  'z,x,y'
  '1/2+z,1/2+x,1/2+y'
  '1/2-y,1/2+z,x'
  '-y,+z,1/2+x'
  'y,1/2+z,-x'
  '1/2+y,+z,1/2-x'
  '1/2+y,-z,x'
  '+y,1/2-z,1/2+x'
  '-y,-z,-x'
  '1/2-y,1/2-z,1/2-x'
  '-x,1/2+y,1/2-z'
  '1/2-x,+y,-z'
  'x,-y,1/2-z'
  '1/2+x,1/2-y,-z'
  '-x,1/2-y,z'
  '1/2-x,-y,1/2+z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
Fe   0.00000   0.00000   0.00000   0.59000   0.01140
Te   0.00000   0.00000   0.00000   0.28000   0.01140
Ti   0.00000   0.00000   0.00000   0.08000   0.01140
Mg   0.00000   0.00000   0.00000   0.05000   0.01140
Te   0.21099   0.00000   0.25000   1.00000   0.01970
O1   0.43610   0.13350   0.39620   1.00000   0.02480
O2   0.17250   0.17250   0.17250   1.00000   0.02130

X-Ray Powder DiffractionHide

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.

Type Occurrence of WalforditeHide

Type Locality:

ⓘ Wendy open pit (Wendy pit), Tambo Mine, El Indio deposit, Elqui Province, Coquimbo, Chile

Place of Conservation of Type Material:

Royal Ontario Museum, Toronto, Canada, M47817, M47818.

Associated Minerals at Type Locality:

Rodalquilarite	Pyrite	Jarosite	Gold	Emmonsite
Alunite

Synonyms of WalforditeHide

IMA1996-003

Other Language Names for WalforditeHide

German:Walfordit

Russian:Уолфордит

Spanish:Walfordita

Common AssociatesHide

Associated Minerals Based on Photo Data:

2 photos of Walfordite associated with Alunite

KAl₃(SO₄)₂(OH)₆

Related Minerals - Nickel-Strunz Grouping Hide

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	Pb²⁺₁₂(Te⁴⁺_O3)₁₁(SO₄)	Tric.
4.JK.55	Plumbotellurite	Pb(TeO₃)	Orth.
4.JK.60	Magnolite	[Hg₂]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 WalforditeHide

In UV light:

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

Other InformationHide

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 WalforditeHide

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 WalforditeHide

mindat.org URL:

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

Search Engines:

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External Links:

Look for Walfordite on Webmineral

Look for Walfordite on Wikipedia

Look for Walfordite on Mineralien Atlas

Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

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Localities for WalforditeHide

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.

Locality ListHide

- 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). ~~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.

Chile (TL)

Coquimbo

Elqui Province

El Indio deposit

Tambo Mine

ⓘ Wendy open pit (Wendy pit) (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.