Mineralogy Database

Erniggliite Mineral Data

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General Erniggliite Information

Help on Chemical  Formula: Chemical Formula: Tl2SnAs2S6
Help on Composition: Composition: Molecular Weight = 869.72 gm
   Thallium  47.00 %  Tl
   Tin       13.65 %  Sn
   Arsenic   17.23 %  As
   Sulfur    22.12 %  S
            100.00 % 
Help on Empirical Formula: Empirical Formula: Tl2SnAs2S6
Help on IMA Status: IMA Status: Approved IMA 1992
Help on Locality: Locality: Lengenbach, Binn, Switzerland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named in 1992 for Ernst Niggli (b.1917), Swiss mineralogist.
Help on Name Pronunciation: Name Pronunciation: Erniggliite + Pronunciation Say ERNIGGLIITE
Help on Synonym: Synonym: ICSD 72907
  PDF 45-1467

Erniggliite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.07245
Help on Cell Dimensions: Cell Dimensions: a = 6.68, c = 7.164, Z = 1; V = 276.85 Den(Calc)= 5.22
Help on Crystal System: Crystal System: Trigonal - Rhombohedral H-M Symbol ( 3) Space Group: P 3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.343(1), 3.029(0.63), 3.06(0.5),

Physical Properties of Erniggliite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Gray, Black gray, Black.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Hardness: Hardness: 2-3 - Gypsum-Calcite
Help on Luster: Luster: Metallic
Help on Streak: Streak: reddish black

Calculated Properties of Erniggliite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.49 gm/cc
note: Specific Gravity of Erniggliite =5.22 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEErniggliite = 861.76 barns/electron
U=PEErniggliite x rElectron Density=3,868.83 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Erniggliite is Not Radioactive

Erniggliite Classification

Help on  Dana Class: Dana Class: (03)Sulfides - Sulfosalts
  (03.04)where z/y > 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.04.18)Dana Group Erniggliite Tl2SnAs2S6 P 3 3
Help on  Strunz Class: Strunz Class: 02.GA.45 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.45 Erniggliite Tl2SnAs2S6 P 3 3

Other Erniggliite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996)
Help on See Also: See Also: Links to other databases for Erniggliite :
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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Dana No: Strunz No: 02.GA.45