Chalcothallite Mineral Data

General Chalcothallite Information

Chemical Formula:

(Cu,Fe)6Tl2SbS4

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 %

Empirical Formula:

Cu₃Fe²⁺₃Tl₂SbS₄

Environment:

In ussingite veins cutting poikilitic sodalite crystals.

IMA Status:

Approved IMA 1967

Locality:

Near Taseq Lake, Ilimaussaq intrusion, Greenland. Link to MinDat.org Location Data.

Name Origin:

Named for the composition (Cu, Tl).

Synonym:

ICSD 100476

PDF 42-557

Chalcothallite Image

Images:

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

Axial Ratios:

a:c = 1:8.9574

Cell Dimensions:

a = 3.827, c = 34.28, Z = 2; V = 502.06 Den(Calc)= 6.73

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4/mmm

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

By Intensity(I/I_o): 3.07(1), 2.48(0.9), 3.93(0.4),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Makovicky E , Johan Z , Karup-Moller S , Neues Jahrbuch fur Mineralogie, Abhandlungen , 138 (1980) p.122-146, New data on bukovite, thalcusite, chalcothallite and rohaite, Locality: Ilimaussaq massif, Greenland

Physical Properties of Chalcothallite

Cleavage:

{001} Perfect, {100} Distinct, {010} Distinct

Color:

Lead gray, Black.

Density:

6.6

Diaphaneity:

Opaque

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Lamellar - Thin laminae producing a lamellar structure.

Habit:

Tarnishes - Freshly fractured surfaces form a surface oxidation film

Hardness:

2-2.5 - Gypsum-Finger Nail

Luster:

Metallic

Streak:

black

Optical Properties of Chalcothallite

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

RL Anisotrophism:

Distinct in orange to red-brown.

RL Color:

Creamy white to light gray with a brownish creamy tint.

RL Pleochroism:

Noticeable in air.

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

Electron Density:

Bulk Density (Electron Density)=5.85 gm/cc
note: Specific Gravity of Chalcothallite =6.73 gm/cc.

Fermion Index:

Fermion Index = 0.0044385728
Boson Index = 0.9955614272

Photoelectric:

PE_{Chalcothallite}= 735.91 barns/electron
U=PE_{Chalcothallite} x rElectron Density=4,305.14 barns/cc.

Radioactivity:

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

Chalcothallite Classification

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

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

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)

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

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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: