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Crookesite

A valid IMA mineral species - grandfathered
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EditAdd SynonymEdit CIF structuresClear Cache
Cu7(Tl, Ag)Se4
Formely considered (Cu,Tl,Ag)2Se.
Colour:
Lead Grey
Lustre:
Metallic
Hardness:
2½ - 3
Specific Gravity:
6.90
Crystal System:
Tetragonal
Name:
Named in honor of Sir William Crookes (17 June 1832, London, England - 4 April 1919, London, England), chemist and physicist. He worked on spectroscopy, and used that technology to discover thallium in 1861.
Type Locality:
ⓘSkrikerum Mine, Valdemarsvik, Östergötland County, Sweden
This page provides mineralogical data about Crookesite.


Unique Identifiers
IMA Formula:
Cu7TlSe4
First published:
1867
Type description reference:
Nordenskiöld, A.E. (1867) Sur les minéraux sélénifères et thallifères de Skrikerum. Bulletin Mensuel de la Société Chimique de Paris: 7: 409-414.

Classification of Crookesite

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
Dana 8th ed.:
2.4.12.1

2 : SULFIDES
4 : AmBnXp, with (m+n):p = 2:1
Hey's CIM Ref.:
3.5.12

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
5 : Sulphides etc. of Hg and Tl

Mineral Symbols
Transparency:
Opaque
Colour:
Lead Grey
Hardness:
2½ - 3 onMohs scale
Hardness:
VHN100=92 - 123 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
Distinct/Good
Two at right angles
Density:
6.90 g/cm3 (Measured)    7.443 g/cm3 (Calculated)

Optical Data of Crookesite
Common Impurities:
Fe

Crystallography of Crookesite
General Appearance of Type Material:
As finely divided, disseminated specks.
Geological Setting of Type Material:
Hydrothermal deposits
Associated Minerals at Type Locality:
BerzelianiteCalciteClausthaliteEucairiteKlockmannite
LinnaeiteQuartzSabatieriteUmangite
Reference:
Nordenskiöld, A.E. (1867) Sur les minéraux sélénifères et thallifères de Skrikerum. Bulletin Mensuel de la Société Chimique de Paris: 7: 409-414.

Other Language Names for Crookesite

Common AssociatesTric.1 :P12.BD.UM2004-33-S:AgCuHgSe(Ag,Cu)8Hg3(S,Se)72.BD.05ImiteriteAg2HgS2Mon. 2/m :P21/b2.BD.10GortdrumiteCu24Fe2Hg9S23Tric.1 :P12.BD.15Danielsite(Cu,Ag)14HgS8Orth.2.BD.15BalkaniteCu9Ag5HgS8Mon. 2/m :P2/m2.BD.20DonharrisiteNi3HgS3Mon. 2/m :B2/m2.BD.25CarliniteTl2STrig. 3 :R32.BD.30Bukovite(Cu3Fe)Σ4Tl2Se4Tet. 4/mmm(4/m2/m2/m) :I4/mmm2.BD.30ThalcusiteTl2Cu3FeS4Tet.2.BD.30MurunskiteK2(Cu,Fe)4S4Tet. 4/mmm(4/m2/m2/m) :I4/mmm2.BD.35Rohaite(Tl,Pb,K)2Cu8.7Sb2S4Orth.2.BD.40ChalcothalliteTl2(Cu,Fe)6SbS4Tet. 4/mmm(4/m2/m2/m) :I4/mmm2.BD.45SabatieriteTlCu6Se4Orth.2.BD.55BrodtkorbiteCu2HgSe2Mon. 2/m :P21/m

Other Information
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    • External Links:
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  • Raman and XRD data at RRUFF project
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  • American Mineralogist Crystal Structure Database
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    • References for CrookesiteⓘTumiñico MinePaar et al. (2002)+2 other references
    Armenia
     
    Khachaturyan (1957)
    Canada
     
    Mineralogical Society of America - ...+1 other reference
    China
     
    Chen et al. (2007)Zhao et al. (1999)
    Czech Republic
     
    Škácha et al. (2017)Sejkora et al. (2024)Sejkora et al. (2024)Kvaček+1 other referenceVavřín+2 other referencesKvaček (1979)
    France
     
    Agrinier et al. (1967)
    Germany
     
    Weiß (1990)Weiß (1990)Forster et al. (2004)
    Sweden (TL)
     
    Am Min 35 (1950)+2 other references
    Switzerland
     
    Stalder et al. (1998)Stalder et al. (1998)
    UK
     
    Rumsey et al. (2015)
    USA
     
    personal correspondence with Doug Scott
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