Wallisite Mineral Data

Wallisite Mineral Data +

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General Wallisite Information

Chemical Formula:

PbTl(Cu,Ag)As2S5

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 %

Empirical Formula:

PbTlCu_0.75Ag_0.25As₂S₅

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.

Synonym:

ICSD 26804

PDF 25-294

Wallisite Image

Images:

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

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 - PinacoidalH-M Symbol ( 1) Space Group: P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.305(1), 2.864(0.84), 3.328(0.82),

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

Cleavage:

[001] Good

Color:

Lead gray, Black.

Diaphaniety:

Opaque

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Luster:

Metallic

Calculated Properties of Wallisite

Electron Density:

r_electron=5.14 gm/cc
note: r_Wallisite=5.98 gm/cc.

Fermion Index

Fermion Index = 0.059
Boson Index = 0.941

Photoelectric:

PE_Wallisite= 930.43 barns/electron
U=PE_Wallisite x r_electron=4,785.80 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Wallisite is Not Radioactive

Wallisite Classification

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

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

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 -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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Print or Cut-and-Paste your Wallisite Specimen Label here :

Wallisite

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

Notes: