Mineralogy Database

Wallisite Mineral Data

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General Wallisite Information

Help on Chemical  Formula: Chemical Formula: PbTl(Cu,Ag)As2S5
Help on Composition: Composition: Molecular Weight = 796.38 gm
   Thallium  25.66 %  Tl
   Copper     5.98 %  Cu
   Silver     3.39 %  Ag
   Arsenic   18.82 %  As
   Lead      26.02 %  Pb
   Sulfur    20.13 %  S
            100.00 % 
Help on Empirical Formula: Empirical Formula: PbTlCu0.75Ag0.25As2S5
Help on Environment: Environment: Overgrowing other lead sulfosalts.
Help on IMA Status: IMA Status: Approved IMA 1968
Help on Locality: Locality: Lengenbach, Binntal, Valais (Wallis), Switzerland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Wallis, the German name for the Swiss Canton in which the Lengenbach quarry is located.
Help on Name Pronunciation: Name Pronunciation: Wallisite + Pronunciation Say WALLISITE
Help on Synonym: Synonym: ICSD 26804
  PDF 25-294

Wallisite Image

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Comments: Gray black, blocky crystalline aggregate of wallisite on striated sulfosalt (dufrénoysite?).
Location: Lengenbach quarry, Binntal, Valais, Switzerland. Scale: Aggregate 5 mm.
© Walter Gabriel

Wallisite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8887:1:0.8643
Help on Cell Dimensions: Cell Dimensions: a = 7.98, b = 8.979, c = 7.761, Z = 2; alpha = 106.11°, beta = 114.48°, gamma = 65.48° V = 442.38 Den(Calc)= 5.98
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.305(1), 2.864(0.84), 3.328(0.82),

Physical Properties of Wallisite

Help on Cleavage: Cleavage: {001} Good
Help on Color: Color: Lead gray, Black.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Luster: Luster: Metallic

Calculated Properties of Wallisite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.98 gm/cc
note: Specific Gravity of Wallisite =5.79 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PEWallisite = 930.43 barns/electron
U=PEWallisite x rElectron Density=4,633.74 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Wallisite is Not Radioactive

Wallisite Classification

Help on  Dana Class: Dana Class: (03)Sulfides - Sulfosalts
  (03.05)where 2.5 < z/y < 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.05.08)Dana Group Wallisite PbTl(Cu,Ag)As2S5 P1 1 Hatchite (Pb,Tl)2AgAs2S5 P1 or P1 1
Help on  Strunz Class: Strunz Class: 02.GC.05 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.G - Sulfarsenites, sulfantimonites, sulfbismuthites
  02.GC -Poly-sulfarsenites
02.GC.05 Hatchite (Pb,Tl)2AgAs2S5 P1 or P1 1
02.GC.05 Wallisite PbTl(Cu,Ag)As2S5 P1 1

Other Wallisite Information

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Wallisite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 02.GC.05





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