Stalderite Mineral Data

Stalderite Mineral Data +

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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.

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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Physical Properties of Stalderite

Cleavage:

None

Color:

Black, Reddish black, Bluish black.

Density:

4.97

Diaphaniety:

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:

r_electron=4.24 gm/cc
note: r_Stalderite=4.76 gm/cc.

Fermion Index

Fermion Index = 0.02277
Boson Index = 0.97723

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Stalderite is Not Radioactive

Stalderite Classification

Dana Class:

3.4.11.2 (3)Sulfides - Sulfosalts

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

(3.4.11)Dana Group

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

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

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

Strunz Class:

II/E.12-25 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 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 -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 -École des Mines de Paris

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Stalderite

TlCu(Zn,Fe,Hg)2As2S6
Dana No: 3.4.11.2 Strunz No: II/E.12-25
Locality:

Notes: