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Chalcothallite

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Formula:
Tl2(Cu,Fe)6SbS4
System:
Tetragonal
Colour:
Lead Grey to iron black
Lustre:
Metallic
Hardness:
2 - 2½
Name:
For the chemical composition.
This page provides mineralogical data about Chalcothallite.

Classification of Chalcothallite

Approved
2.BD.40

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
B : Metal Sulfides, M: S > 1: 1 (mainly 2: 1)
D : With Hg, Tl
3.2.7.1

3 : SULFOSALTS
2 : ø = 4
5.5.16

5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
5 : Sulpharsenites etc. of Tl
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First Recorded Occurrence of Chalcothallite

Year of Discovery:
1978
Geological Setting of First Recorded Material:
Ussingite veins in poikilitic sodalite syenite

Physical Properties of Chalcothallite

Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Lead Grey to iron black
Comment:
Iridescent tarnish
Streak:
Black
Hardness (Mohs):
2 - 2½
Hardness (Vickers):
VHN50=68 - 76 kg/mm2
Comment:
VHN on (001)
Tenacity:
Waxy
Cleavage:
Perfect
perfect on {001}
indistinct on {100} {010}
Comment:
Plastic, tectonically deformed.
Density:
6.6 g/cm3 (Measured)    6.74 g/cm3 (Calculated)

Crystallography of Chalcothallite

Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
I4/mmm
Space Group Setting:
I4/mmm
Cell Parameters:
a = 3.827(1) Å, c = 34.280(1) Å
Ratio:
a:c = 1 : 8.957
Unit Cell Volume:
V 502.06 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Lamellar aggregatesd to 2cm
Twinning:
Fine grid of lamellae parallel to (110) and (110)

Optical Data of Chalcothallite

Type:
Anisotropic
Anisotropism:
Distinct in orange to red-browns
Colour in reflected light:
Creamy white to light gray with brownish creamy tint
Pleochroism:
Visible

Chemical Properties of Chalcothallite

Formula:
Tl2(Cu,Fe)6SbS4
Essential elements:
All elements listed in formula:
Common Impurities:
Pb,Se

Relationship of Chalcothallite to other Species

2.BD.UM2004-33-S:AgCuHgSe(Ag,Cu)8Hg3(S,Se)7
2.BD.05ImiteriteAg2HgS2
2.BD.10Gortdrumite(Cu,Fe)6Hg2S5
2.BD.15BalkaniteCu9Ag5HgS8
2.BD.15Danielsite(Cu,Ag)14HgS8
2.BD.20DonharrisiteNi8Hg3S9
2.BD.25CarliniteTl2S
2.BD.30BukoviteTl2(Cu,Fe)4Se4
2.BD.30MurunskiteK2(Cu,Fe)4S4
2.BD.30ThalcusiteTl2Cu3FeS4
2.BD.35Rohaite(Tl,Pb,K)2Cu8.7Sb2S4
2.BD.45SabatieriteCu6TlSe4
2.BD.50CrookesiteCu7(Tl, Ag)Se4
2.BD.55BrodtkorbiteCu2HgSe2
5.5.1LoránditeTlAsS2
5.5.2EllisiteTl3AsS3
5.5.3ImhofiteTl5.8As15.4S26
5.5.4SimoniteTlHgAs3S6
5.5.6ChristiteTlHgAsS3
5.5.6RouthieriteTl(Cu,Ag)(Hg,Zn)2(As,Sb)2S6
5.5.7HutchinsoniteTlPbAs5S9
5.5.8Wallisite(Cu,Ag)TlPbAs2S5
5.5.9BernarditeTl(As,Sb)5S8
5.5.10VrbaiteTl4Hg3Sb2As8S20
5.5.11RebuliteTl5Sb5As8S22
5.5.12GillulyiteTl2(As,Sb)8S13
5.5.13WeissbergiteTlSbS2
5.5.14Rohaite(Tl,Pb,K)2Cu8.7Sb2S4
5.5.15VaughaniteTlHgSb4S7
5.5.17PierrotiteTl2Sb6As4S16
5.5.18ParapierrotiteTl(Sb,As)5S8
5.5.19CriddleiteTlAg2Au3Sb10S10
5.5.20ChabournéiteTl21-xPb2x(Sb,As)91-xS147 (x = 0-17.5)

Other Names for Chalcothallite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Chalcothallite

Reference List:
American Mineralogist: 53: 1775.

American Mineralogist: 64: 658.

Internet Links for Chalcothallite

Localities for Chalcothallite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Greenland
 
  • Kujalleq
    • Narsaq
Petersen, O.V. (2001): List of all minerals identified in the Ilímaussaq alkaline complex, South Greenland. Geology of Greenland Survey Bulletin. 190, 25-33
Karup-Moeller, S., Makovicky E. (2001): Thalcusite from Nakkaalaaq, the Ilimaussaq alkaline complex, South Greenland, South Greenland, Geology of Greenland Survey Bulletin, 190, 127-130
        • Taseq area
Semenov, E.I., Sørensen, H., Bessmertnaja, M.S. & Novorossova, L.E. (1967): Chalcothallite – a new sulphide of copper and thallium from the Ilímaussaq alkaline intrusion, South Greenland. Bulletin Grønlands Geologiske Undersøgelse 683, 13–26 (also Meddelelser om Grønland 181(5), 13-26).
Karup-Moeller, S., Makovicky E. (2001): Thalcusite from Nakkaalaaq, the Ilimaussaq alkaline complex, South Greenland, South Greenland, Geology of Greenland Survey Bulletin, 190, 127-130
Mineral and/or Locality  
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