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About CrookesiteHide

William Crookes
Cu7(Tl, Ag)Se4
Formely considered (Cu,Tl,Ag)2Se.
Lead Grey
2½ - 3
Specific Gravity:
Crystal System:
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.
This page provides mineralogical data about Crookesite.

Classification of CrookesiteHide

Approved, 'Grandfathered' (first described prior to 1959)

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

4 : AmBnXp, with (m+n):p = 2:1

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

Physical Properties of CrookesiteHide

Lead Grey
2½ - 3 on Mohs scale
VHN100=92 - 123 kg/mm2 - Vickers
Two at right angles
6.90 g/cm3 (Measured)    7.443 g/cm3 (Calculated)

Optical Data of CrookesiteHide

Weak but distinct in brownish tones

Chemical Properties of CrookesiteHide

Cu7(Tl, Ag)Se4

Formely considered (Cu,Tl,Ag)2Se.
IMA Formula:
Common Impurities:

Crystallography of CrookesiteHide

Crystal System:
Cell Parameters:
a = 10.435 Å, c = 3.954 Å
a:c = 1 : 0.379
Unit Cell V:
430.55 ų (Calculated from Unit Cell)
Disseminated specks and in veinlets.

Type Occurrence of CrookesiteHide

Geological Setting of Type Material:
Hydrothermal deposits

Other Language Names for CrookesiteHide

Simplified Chinese:硒铊银铜矿
Traditional Chinese:硒鉈銅銀礦

Common AssociatesHide

Associated Minerals Based on Photo Data:
Calcite7 photos of Crookesite associated with Calcite on
Bukovite6 photos of Crookesite associated with Bukovite on
Biotite2 photos of Crookesite associated with Biotite on
Klockmannite2 photos of Crookesite associated with Klockmannite on
Berzelianite1 photo of Crookesite associated with Berzelianite on

Related Minerals - Nickel-Strunz GroupingHide

2.BD.10GortdrumiteCu24Fe2Hg9S23Tric. 1 : P1
2.BD.15BalkaniteCu9Ag5HgS8Mon. 2/m : P2/m
2.BD.20DonharrisiteNi3HgS3Mon. 2/m : B2/m
2.BD.25CarliniteTl2STrig. 3 : R3
2.BD.40ChalcothalliteTl2(Cu,Fe)6SbS4Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
2.BD.55BrodtkorbiteCu2HgSe2Mon. 2/m : P21/m

Related Minerals - Dana Grouping (8th Ed.)Hide

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

3.5.1CinnabarHgSTrig. 3 2 : P31 2 1
3.5.3MetacinnabarHgSIso. 4 3m : F4 3m
3.5.5TiemanniteHgSeIso. 4 3m : F4 3m
3.5.6BalkaniteCu9Ag5HgS8Mon. 2/m : P2/m
3.5.8ColoradoiteHgTeIso. m3m (4/m 3 2/m)
3.5.9GortdrumiteCu24Fe2Hg9S23Tric. 1 : P1
3.5.11CarliniteTl2STrig. 3 : R3
3.5.14PicotpauliteTlFe2S3Orth. mmm (2/m 2/m 2/m) : Cmcm
3.5.18GalliteCuGaS2Tet. 4 2m : I4 2d
3.5.19RoquesiteCuInS2Tet. 4 2m : I4 2d
3.5.20InditeFeIn2S4Iso. m3m (4/m 3 2/m) : Fd3m

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 CrookesiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Nordenskiöld, A.E. (1867) Sur les minéraux sélénifères et thallifères de Skrikerum. Bulletin Mensuel de la Société Chimique de Paris: 7: 409-414.
Palache, C., Berman, H., Frondel, C. (1944) The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged, 834pp.: 183.
Earley, J.W. (1950) Description and synthesis of the selenide minerals. American Mineralogist: 35: 337-364.
Johan, Z. (1987) Crookesite, TlCu7Se4; new data and isotypism with NH4Cu7S4 (La crookesite, TlCu7Se4: nouvelles données et isotypie avec NH4Cu7S4.). Comptes Rendus de L’Académie des Sciences Paris: 304: 1121–1124 (in French).
Jambor, J.L., Bladh, K.W., Ercit, T.S., Grice, J.D., Grew, E.S. (1988) New mineral names. American Mineralogist: 73: 927-935.
Jambor, J.L., Burke, E.A.J. (1989) New mineral names. American Mineralogist: 74: 1399-1404.
Berger, R.A. (1987) Crookesite and sabatierite in a new light — a crystallographer’s comment. Zeitschrift für Kristallographie: 181: 241-249.
Eriksson, L., Werner, P.E., Berger, R., Meerschaut, A. (1991) Structure refinement of TlCu7Se4 from X-ray powder profile data. Journal of Solid State Chemistry: 90: 61-68.
Criddle, A.J., Stanley, C.J., Eds. (1993) Quantitative data file for ore minerals, 3rd ed. Chapman & Hall, London, 120.

Internet Links for CrookesiteHide

Localities for CrookesiteHide

ⓘ - 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.
  • La Rioja
    • General Lamadrid department
      • Villa Castelli
        • Sierra de Cacho
de Brodtkorb, M. K., & Crosta, S. (2010). Reseña de la ubicación geográfica de los seleniuros de la Sierra de Umango, provincia de La Rioja. Revista de la Asociación Geológica Argentina, 67(2), 272-279.
Khachaturyan, E. A.. (1957): Mineralogy of pyrite ores in the Tanzut and Chibukhla deposits of the Armenian S.S.R. Izvest. Akad. Nauk Armyan. S.S.R., Ser. Geol. i Geograf. Nauk 10 (No. 3), 13-20.
  • Saskatchewan
Handbook of Mineralogy; Stylianos Augustithis (1995) Atlas of the Textural Patterns of Ore Minerals and Metallogenic Processes
  • Anhui Province
    • Huaibei Prefecture
      • Suixi Co.
        • Sanpu ore field
Yanjing Chen, Huayong Chen, Khin Zaw, Pirajno, F., and Zengjie Zhang (2007): Ore Geology Reviews 31, 139-169.
Yiming Zhao, Yinan Zhang, and Chengsi Bi (1999): Ore Geology Reviews 14, 227-249.
Czech Republic
  • Vysočina Region
    • Žďár nad Sázavou District
      • Nové Město na Moravě
Kvaček, M.: Selenides from the deposits of Western Moravia, Czechoslovakia – Part II. Acta Universitatis Carolinae – Geologica, 1979, vol. 23, nos. 1-2, s. 15-38. ; Econ Geol (1997) 92:468-484
      • Rožná
        • Rožná deposit
Vavřín, I.: Nové poznatky o selenidech Českého masívu. Bulletin Mineralogicko-petrografického oddělení Národního muzea v Praze, 1994, roč. 2, s. 82-89. ; Econ Geol (1997) 92:468-484; American Mineralogist 73:933
Kvaček, M.: Selenides from the deposits of Western Moravia, Czechoslovakia – Part II. Acta Universitatis Carolinae – Geologica, 1979, vol. 23, nos. 1-2, s. 15-38.
  • Lower Saxony
    • Harz
      • Bad Sachsa
        • Zorge
Weiss: "Mineralfundstellen, Deutschland West", 1990
      • Lerbach
Weiss: "Mineralfundstellen, Deutschland West", 1990
Sweden (TL)
  • Östergötland
    • Valdemarsvik
Am Min 35 (1950), 337; Sandström, F. (2007): Skrikerum. Litiofilen 24 (1), 22-38; Econ Geol (1997) 92:468-484
  • Aargau
    • Laufenburg
      • Kaisten
Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): Mineralienlexikon der Schweiz. Wepf (Basel), p. 126.
    • Rheinfelden
Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): Mineralienlexikon der Schweiz. Wepf (Basel), p. 126.
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