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Chalcothallite

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Formula:
Tl2(Cu,Fe)6SbS4
Colour:
Lead Grey to iron black
Lustre:
Metallic
Hardness:
2 - 2½
Specific Gravity:
6.6
Crystal System:
Tetragonal
Name:
For the chemical composition.
This page provides mineralogical data about Chalcothallite.


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Classification of ChalcothalliteHide

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

Physical Properties of ChalcothalliteHide

Metallic
Transparency:
Opaque
Colour:
Lead Grey to iron black
Comment:
Iridescent tarnish
Streak:
Black
Hardness:
2 - 2½ on Mohs scale
Hardness:
VHN50=68 - 76 kg/mm2 - Vickers
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)

Optical Data of ChalcothalliteHide

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 ChalcothalliteHide

Formula:
Tl2(Cu,Fe)6SbS4
IMA Formula:
(Cu,Fe,Ag)6.3(Tl,K)2SbS4
Common Impurities:
Pb,Se

Crystallography of ChalcothalliteHide

Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
I4/mmm
Setting:
I4/mmm
Cell Parameters:
a = 3.827(1) Å, c = 34.280(1) Å
Ratio:
a:c = 1 : 8.957
Unit Cell 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)

Type Occurrence of ChalcothalliteHide

Geological Setting of Type Material:
Ussingite veins in poikilitic sodalite syenite

Synonyms of ChalcothalliteHide

Other Language Names for ChalcothalliteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Cuprostibite1 photo of Chalcothallite associated with Cuprostibite on mindat.org.
Ussingite1 photo of Chalcothallite associated with Ussingite on mindat.org.
Sphalerite1 photo of Chalcothallite associated with Sphalerite on mindat.org.
Sodalite1 photo of Chalcothallite associated with Sodalite on mindat.org.
Natrolite1 photo of Chalcothallite associated with Natrolite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

2.BD.UM2004-33-S:AgCuHgSe(Ag,Cu)8Hg3(S,Se)7
2.BD.05ImiteriteAg2HgS2Mon.
2.BD.10GortdrumiteCu18FeHg6S16Orth.
2.BD.15BalkaniteCu9Ag5HgS8Mon. 2/m : P2/m
2.BD.15Danielsite(Cu,Ag)14HgS8Orth.
2.BD.20DonharrisiteNi3HgS3Mon. 2/m : B2/m
2.BD.25CarliniteTl2STrig. 3 : R3
2.BD.30BukoviteTl2(Cu,Fe)4Se4Tet.
2.BD.30MurunskiteK2(Cu,Fe)4S4Tet.
2.BD.30ThalcusiteTl2Cu3FeS4Tet.
2.BD.35Rohaite(Tl,Pb,K)2Cu8.7Sb2S4Orth.
2.BD.45SabatieriteCu6TlSe4Orth.
2.BD.50CrookesiteCu7(Tl, Ag)Se4Tet.
2.BD.55BrodtkorbiteCu2HgSe2Mon. 2/m : P21/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

5.5.1LoránditeTlAsS2Mon. 2/m : P21/b
5.5.2EllisiteTl3AsS3Trig. 3m : R3m
5.5.3ImhofiteTl5.8As15.4S26Mon. 2/m
5.5.4SimoniteTlHgAs3S6Mon. 2/m
5.5.6ChristiteTlHgAsS3Mon. 2/m
5.5.6RouthieriteTl(Cu,Ag)(Hg,Zn)2(As,Sb)2S6Tet. 4 2m : I4 2m
5.5.7HutchinsoniteTlPbAs5S9Orth.
5.5.8Wallisite(Cu,Ag)TlPbAs2S5Tric.
5.5.9BernarditeTlAs5S8Mon. 2/m : P21/b
5.5.10VrbaiteHg3Tl4As8Sb2S20Orth. mmm (2/m 2/m 2/m) : Cmca
5.5.11RebuliteTl5Sb5As8S22Mon. 2/m : P21/b
5.5.12GillulyiteTl2(As,Sb)8S13Mon.
5.5.13WeissbergiteTlSbS2Tric. 1 : P1
5.5.14Rohaite(Tl,Pb,K)2Cu8.7Sb2S4Orth.
5.5.15VaughaniteTlHgSb4S7Tric.
5.5.17PierrotiteTl2(Sb,As)10S16Orth. mm2 : Pna21
5.5.18ParapierrotiteTlSb5S8Mon. m
5.5.19CriddleiteTlAg2Au3Sb10S10Mon.
5.5.20ChabournéiteTl4Pb2(Sb,As)20S34Tric. 1 : P1

Other InformationHide

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 ChalcothalliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist: 53: 1775.
American Mineralogist: 64: 658.

Internet Links for ChalcothalliteHide

Localities for ChalcothalliteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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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