Stalderite Mineral Data

General Stalderite Information

Chemical Formula:

TlCu(Zn,Fe,Hg)2As2S6

Composition:

Molecular Weight = 761.31 gm

Thallium 26.85 % Tl

Zinc 9.45 % Zn

Iron 5.13 % Fe

Copper 8.35 % Cu

Mercury 5.27 % Hg

Arsenic 19.68 % As

Sulfur 25.27 % S

______

100.00 %

Empirical Formula:

TlCuZn_1.1Fe²⁺_0.7Hg_0.2As₂S₆

Environment:

In small cavities of hydrothermal origin in Triassic dolomite.

IMA Status:

Approved IMA 1993

Locality:

Lengenbach, Binntal, Canton Wallis, Switzerland. Link to MinDat.org Location Data.

Name Origin:

For Prof. Dr. Hans A. Stalder (1925-) of the Natural History Museum, Berne, Switzerland.

Name Pronunciation:

Stalderite + Pronunciation

Synonym:

ICSD 81209

IMA1987-024

PDF 49-1837

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Stalderite Crystallography

Axial Ratios:

a:c = 1:1.10979

Cell Dimensions:

a = 9.855, c = 10.937, Z = 4; V = 1,062.21 Den(Calc)= 4.76

Crystal System:

Tetragonal - ScalenohedralH-M Symbol (4 2m) Space Group: I 42m

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

By Intensity(I/I_o): 1.94(1), 4.086(0.51), 2.436(0.39),

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Crystal Structure:

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Graeser S , Schwander H , Wulf R , Edenharter A , Schweizerische Mineralogische und Petrographische Mitteilungen , 75 (1995) p.337-345, Stalderite TlCu(Zn,Fe,Hg)2As2S6 - a new mineral related to routhierite:, description and crystal structure determination, Locality: Lengenbach, Binntal, Ct. Valais, Switzerland

Physical Properties of Stalderite

Cleavage:

None

Color:

Black, Reddish black, Bluish black.

Density:

4.97

Diaphaneity:

Opaque

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Hardness:

3.5-4 - Copper Penny-Fluorite

Luminescence:

Non-fluorescent.

Luster:

Metallic

Streak:

brownish red

Calculated Properties of Stalderite

Electron Density:

Bulk Density (Electron Density)=4.24 gm/cc
note: Specific Gravity of Stalderite =4.76 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Stalderite= 553.24 barns/electron
U=PE_Stalderite x rElectron Density=2,346.63 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Stalderite is Not Radioactive

Stalderite Classification

Dana Class:

03.04.11.02 (03)Sulfides - Sulfosalts

(03.04)where z/y > 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(03.04.11)Dana Group

03.04.11.01 Routhierite TlCu(Hg,Zn)2(As,Sb)2S3 I 4mm 4mm

03.04.11.02 Stalderite TlCu(Zn,Fe,Hg)2As2S6 I 42m 4 2m

03.04.11.03 Quadratite! Ag(Cd,Pb)AsS3 I 4/amd 4/m 2/m 2/m

Strunz Class:

02.GA.40 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.G - Sulfarsenites, sulfantimonites, sulfbismuthites

02.GA -Neso-sulfarsenites, etc., without additional S

02.GA.40 Routhierite TlCu(Hg,Zn)2(As,Sb)2S3 I 4mm 4mm

02.GA.40 Stalderite TlCu(Zn,Fe,Hg)2As2S6 I 42m 4 2m

Other Stalderite Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.78,p846,1993)

See Also:

Links to other databases for Stalderite :
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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Print or Cut-and-Paste your Stalderite Specimen Label here :

Stalderite

TlCu(Zn,Fe,Hg)2As2S6
Dana No: 03.04.11.02 Strunz No: 02.GA.40
Locality:

Notes: