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Wallisite Mineral Data
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General Wallisite Information
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 Chemical Formula: |
PbTl(Cu,Ag)As2S5 |
| Composition: |
Molecular Weight = 796.38 gm |
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Thallium 25.66 % Tl |
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Copper 5.98 % Cu |
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Silver 3.39 % Ag |
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Arsenic 18.82 % As |
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Lead 26.02 % Pb |
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Sulfur 20.13 % S |
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______ |
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100.00 % |
| Empirical Formula: |
PbTlCu0.75Ag0.25As2S5 |
| Environment: |
Overgrowing other lead sulfosalts. |
| IMA Status: |
Approved IMA 1968 |
| Locality: |
Lengenbach, Binntal, Valais (Wallis), Switzerland. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Wallis, the German name for the Swiss Canton in which the Lengenbach quarry is located. |
| Name Pronunciation: |
Wallisite + Pronunciation  |
| Synonym: |
ICSD 26804 |
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PDF 25-294 |
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Wallisite Image |
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Images:
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Wallisite
Comments: Gray black, blocky crystalline aggregate of wallisite on striated sulfosalt (dufrénoysite?).
Location: Lengenbach quarry, Binntal, Valais, Switzerland.
Scale: Aggregate 5 mm.
© Walter Gabriel |
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Wallisite Crystallography
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| Axial Ratios: |
a:b:c =0.8887:1:0.8643 |
| 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 |
| Crystal System: |
Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1 |
| X Ray Diffraction: |
By Intensity(I/Io): 3.305(1), 2.864(0.84), 3.328(0.82), |
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Physical Properties of Wallisite
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| Cleavage: |
{001} Good |
| Color: |
Lead gray, Black. |
| Diaphaneity: |
Opaque |
| Habit: |
Massive - Uniformly indistinguishable crystals forming large masses. |
| Luster: |
Metallic |
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Calculated Properties of Wallisite
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| Electron Density: |
Bulk Density (Electron Density)=4.98 gm/cc
note: Specific Gravity of Wallisite =5.79 gm/cc.
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| Fermion Index: |
Fermion Index = 0.05
Boson Index = 0.95 |
| Photoelectric: |
PEWallisite = 930.43 barns/electron
U=PEWallisite x rElectron Density=4,633.74 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Wallisite is Not Radioactive |
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Wallisite Classification
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| Dana Class: |
03.05.08.01 (03)Sulfides - Sulfosalts |
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(03.05)where 2.5 < z/y < 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.05.08)Dana Group |
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03.05.08.01 Wallisite PbTl(Cu,Ag)As2S5 P1 1 |
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03.05.08.02 Hatchite (Pb,Tl)2AgAs2S5 P1 or P1 1 |
| Strunz Class: |
02.GC.05 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.G - Sulfarsenites, sulfantimonites, sulfbismuthites |
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02.GC -Poly-sulfarsenites |
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02.GC.05 Hatchite (Pb,Tl)2AgAs2S5 P1 or P1 1 |
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02.GC.05 Wallisite PbTl(Cu,Ag)As2S5 P1 1 |
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Other Wallisite Information
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| References: |
NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) |
| 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
15 - WWW-MINCRYST
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Wallisite
PbTl(Cu,Ag)As2S5
Dana No: 03.05.08.01 Strunz No: 02.GC.05
Locality:
Notes:
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