Mineralogy Database

Walfordite Mineral Data

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General Walfordite Information

Help on Chemical  Formula: Chemical Formula: (Fe+++,Te++++++)Te++++3O8
Help on Composition: Composition: Molecular Weight = 591.76 gm
   Iron        6.13 %  Fe    7.89 % FeO
   Tellurium  72.24 %  Te   90.35 % TeO2
   Oxygen     21.63 %  O
             ______        ______ 
             100.00 %       98.24 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+0.65Te0.35Te3O8
Help on Environment: Environment: Found in brecciated silicified rhyolitic and dacitic pyroclastic rocks. The Fe+++ dominant analog of winstanleyite.
Help on IMA Status: IMA Status: Approved IMA 1996 (Dana # Added)
Help on Locality: Locality: Wendy open pit of the Tambo mine, El Indio � Tambo mining property, 160 km east of La Serena, Cquimbo Province, northern Chile. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after 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.
Help on Synonym: Synonym: IMA1996-003

Walfordite Image

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Comments: Crystal of orange walfordite on a matrix of alunite, (CanMin, v37:1261).
Location: Wendy open pit, Tambo mine, El Indio - Tambo mining property, Coquimbo Province, Chile. Scale: Crystal Size 0.2 mm.
© Canadian Mineralogist

Walfordite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 11.011, Z = 4; V = 1,335.00 Den(Calc)= 2.94
Help on Crystal System: Crystal System: Isometric Space Group: I2, I a3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.175(1), 1.658(0.45), 1.944(0.44),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 1 1) ( 1 0 0)

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Physical Properties of Walfordite

Help on Cleavage: Cleavage: None
Help on Color: Color: Orange.
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Luster: Luster: Adamantine
Help on Streak: Streak: orange yellow

Optical Properties of Walfordite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -1.026 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.398,KC= 0.1964
Ncalc = 1.58
Help on Optical Data: Optical Data: Isotropic, n=2.17.

Calculated Properties of Walfordite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.53 gm/cc
note: Specific Gravity of Walfordite =2.94 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PEWalfordite = 259.14 barns/electron
U=PEWalfordite x rElectron Density= 656.88 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Walfordite is Not Radioactive

Walfordite Classification

Help on  Dana Class: Dana Class: (34)Selenites - Tellurites - Sulfites
  (34.05)Dana Type
  (34.05.02)Dana Group Winstanleyite TiTe3O8 I 21/a3 2/m 3 Walfordite! (Fe,Te)Te3O8 I2, I a3 Cubic
Help on  Strunz Class: Strunz Class: 04.JK.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.J - Arsenites, Antimonites, Bismuthites, Sulfites,
  04.JK -Tellurites without additional anions, without H2O
04.JK.05 Walfordite! (Fe,Te)Te3O8 I2, I a3 Cubic
04.JK.05 Winstanleyite TiTe3O8 I 21/a3 2/m 3

Other Walfordite Information

Help on References: References: NAME( MinRec, Vol 31, No 4) PHYS. PROP.(MinRec, Vol 31, No 4) OPTIC PROP.(MinRec, Vol 31, No 4)
Help on See Also: See Also: Links to other databases for Walfordite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: Strunz No: 04.JK.05





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