Mineralogy Database

Chalcothallite Mineral Data

Search Webmineral :
  
Advertisment

General Chalcothallite Information

Help on Chemical  Formula: Chemical Formula: (Cu,Fe)6Tl2SbS4
Help on Composition: Composition: Molecular Weight = 1,016.96 gm
   Thallium  40.19 %  Tl
   Iron      16.47 %  Fe
   Copper    18.75 %  Cu
   Antimony  11.97 %  Sb
   Sulfur    12.61 %  S
            ______ 
            100.00 % 
Help on Empirical Formula: Empirical Formula: Cu3Fe2+3Tl2SbS4
Help on Environment: Environment: In ussingite veins cutting poikilitic sodalite crystals.
Help on IMA Status: IMA Status: Approved IMA 1967
Help on Locality: Locality: Near Taseq Lake, Ilimaussaq intrusion, Greenland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the composition (Cu, Tl).
Help on Synonym: Synonym: ICSD 100476
  PDF 42-557
 

Chalcothallite Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image

  Chalcothallite

Comments: Gray-black, platy chalcothallite aggregates in matrix.
Location: Taseq Slope, Ilimaussaq Complex, Narsaq, Kitaa, West Greenland, Denmark. Scale: Specimen Size 6x20 mm.
© Diederik Visser

Chalcothallite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:8.9574
Help on Cell Dimensions: Cell Dimensions: a = 3.827, c = 34.28, Z = 2; V = 502.06 Den(Calc)= 6.73
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: I 4/mmm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.07(1), 2.48(0.9), 3.93(0.4),
 

Physical Properties of Chalcothallite

Help on Cleavage: Cleavage: {001} Perfect, {100} Distinct, {010} Distinct
Help on Color: Color: Lead gray, Black.
Help on Density: Density: 6.6
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Lamellar - Thin laminae producing a lamellar structure.
Help on Habit: Habit: Tarnishes - Freshly fractured surfaces form a surface oxidation film
Help on Hardness: Hardness: 2-2.5 - Gypsum-Finger Nail
Help on Luster: Luster: Metallic
Help on Streak: Streak: black
 

Optical Properties of Chalcothallite

Help on Optical Data: Optical Data: NCalc= 1.7 - from Gladstone-Dale relationship (KC = 0.1035) where Ncalc=Dcalc*KC+1
NCalc= 1.68 - from Gladstone-Dale relationship (KC = 0.1035) where Ncalc=Dmeas*KC+1
Help on RL Anisotrophism: RL Anisotrophism: Distinct in orange to red-brown.
Help on RL Color: RL Color: Creamy white to light gray with a brownish creamy tint.
Help on RL Pleochroism: RL Pleochroism: Noticeable in air.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Chalcothallite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   29.10   31.10 
   
 420 nm   28.20   31.30 
 440 nm   27.30   31.30 
 460 nm   26.60   31.10 
 480 nm   26.20   30.50 
 500 nm   25.80   30.30 
 520 nm   25.70   29.80 
 540 nm   25.40   29.10 
 560 nm   25.30   28.60 
 580 nm   25.10   28.20 
 600 nm   25.10   27.70 
 620 nm   25.10   27.40 
 640 nm   25.10   27.20 
 660 nm   25.00   27.20 
 680 nm   24.90   27.10 
 700 nm   25.00   27.20 
Calculated Relative Intensity Colors of Chalcothallite in Air
Relative
Intensity
   0%   40%   80% 100% 120% 160% 200% 240% 280% 320% 350%
R1                      
R2                      
 

Calculated Properties of Chalcothallite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.85 gm/cc
note: Specific Gravity of Chalcothallite =6.73 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0044385728
Boson Index = 0.9955614272
Help on Photoelectric: Photoelectric: PEChalcothallite = 735.91 barns/electron
U=PEChalcothallite x rElectron Density=4,305.14 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Chalcothallite is Not Radioactive
 

Chalcothallite Classification

Help on  Dana Class: Dana Class: 03.02.07.01 (03)Sulfides - Sulfosalts
  (03.02)where z/y = 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.02.07)Dana Group
 
03.02.07.01 Chalcothallite (Cu,Fe)6Tl2SbS4 I 4/mmm 4/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 02.BD.40 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1)
  02.BD -With Hg, Tl
 
02.BD.40 Chalcothallite (Cu,Fe)6Tl2SbS4 I 4/mmm 4/m 2/m 2/m
 

Other Chalcothallite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Chalcothallite :
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
15 - WWW-MINCRYST

Search for Chalcothallite using:

Google
 
Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Chalcothallite :

Ask about Chalcothallite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaņol

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

Chalcothallite

(Cu,Fe)6Tl2SbS4
Dana No: 03.02.07.01 Strunz No: 02.BD.40
Locality:

 

Notes:

 

 
   
 


Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.