Erniggliite Mineral Data

Erniggliite Mineral Data +

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General Erniggliite Information

Chemical Formula:

Tl2SnAs2S6

Composition:

Molecular Weight = 869.72 gm

Thallium 47.00 % Tl

Tin 13.65 % Sn

Arsenic 17.23 % As

Sulfur 22.12 % S

______

100.00 %

Empirical Formula:

Tl₂SnAs₂S₆

IMA Status:

Approved IMA 1992

Locality:

Lengenbach, Binn, Switzerland. Link to MinDat.org Location Data.

Name Origin:

Named in 1992 for Ernst Niggli (b.1917), Swiss mineralogist.

Synonym:

ICSD 72907

IMA1987-025

PDF 45-1467

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Erniggliite Crystallography

Axial Ratios:

a:c = 1:1.07245

Cell Dimensions:

a = 6.68, c = 7.164, Z = 1; V = 276.85 Den(Calc)= 5.22

Crystal System:

Trigonal - RhombohedralH-M Symbol ( 3) Space Group: P 3

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

By Intensity(I/I_o): 3.343(1), 3.029(0.63), 3.06(0.5),

Physical Properties of Erniggliite

Cleavage:

[???] Perfect

Color:

Gray, Black gray, Black.

Diaphaniety:

Opaque

Hardness:

2-3 - Gypsum-Calcite

Luster:

Metallic

Streak:

reddish black

Calculated Properties of Erniggliite

Electron Density:

r_electron=4.49 gm/cc
note: r_Erniggliite=5.22 gm/cc.

Fermion Index

Fermion Index = 0.02434
Boson Index = 0.97566

Photoelectric:

PE_Erniggliite= 861.76 barns/electron
U=PE_Erniggliite x r_electron=3,868.83 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Erniggliite is Not Radioactive

Erniggliite Classification

Dana Class:

3.4.18.1 (3)Sulfides - Sulfosalts

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

(3.4.18)Dana Group

3.4.18.1 Erniggliite Tl2SnAs2S6 P 3 3

Strunz Class:

II/E.12-45 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 Erniggliite Information

References:

NAME( Dana8) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996)

See Also:

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

Erniggliite

Tl2SnAs2S6
Dana No: 3.4.18.1 Strunz No: II/E.12-45
Locality:

Notes: