Wallisite Mineral Data + Say WALLISITE

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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 Synonym: Synonym: ICSD 26804
  PDF 25-294
 

Wallisite Image

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Wallisite

Comments: Gray black, blocky crystalline aggregate of wallisite on striated sulfosalt (dufr?noysite?).
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 - PinacoidalH-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),
Click Here for Large Wallisite Structure Window Crystal Structure:

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Takeuchi Y , Ohmasa M , Zeitschrift fur Kristallographie , 127 (1968) p.349-365, The crystal structure of wallisite, PbTlCuAs2S5,, the Cu analogue of hatchite PbTlAgAs2S5, Locality: Lengenbach quarry, Binnatal, Switzerland

 

Physical Properties of Wallisite

Help on Cleavage: Cleavage: [001] Good
Help on Color: Color: Lead gray, Black.
Help on Diaphaniety: Diaphaniety: 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:

relectron=5.14 gm/cc
note: rWallisite =5.98 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.059
Boson Index = 0.941
Help on Photoelectric: Photoelectric:

PEWallisite = 930.43 barns/electron
U=PEWallisite x relectron=4,785.80 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: 3.5.8.1 (3)Sulfides - Sulfosalts
  (3.5)where 2.5 < z/y < 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (3.5.8)Dana Group
 
3.5.8.1 Wallisite PbTl(Cu,Ag)As2S5 P1 1
 
3.5.8.2 Hatchite (Pb,Tl)2AgAs2S5 P1 or P1 1
Help on  Strunz Class: Strunz Class: II/E.12-60 II - Sulfides and sulphosalts
  II/E - Sulfosalts (S : As,Sb,Bi = x) Sulfosalts with predominant Thallium and Mercury, x = 4.0 - 1.6
  II/E.12 - Laffittite - Hatchite series
 
II/E.12-10 Laffittite AgHgAsS3 Aa m
 
II/E.12-20 Routhierite TlCu(Hg,Zn)2(As,Sb)2S3 I 4mm 4mm
 
II/E.12-25 Stalderite TlCu(Zn,Fe,Hg)2As2S6 I 42m 4 2m
 
II/E.12-30 Christite TlHgAsS3 P 21/n 2/m
 
II/E.12-40 Ellisite Tl3AsS3 R 3m 3m
 
II/E.12-45 Erniggliite Tl2SnAs2S6 P 3 3
 
II/E.12-60 Wallisite PbTl(Cu,Ag)As2S5 P1 1
 
II/E.12-70 Hatchite (Pb,Tl)2AgAs2S5 P1 or P1 1
 
II/E.12-80 Sicherite! TlAg2(As,Sb)3S6 Pmnb 2/m 2/m 2/m
 

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Wallisite

PbTl(Cu,Ag)As2S5
Dana No: 3.5.8.1 Strunz No: II/E.12-60
Locality:

 

Notes:

 

 
   
 
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