SUPPORT US. If is important to you, click here to donate to our Fall 2019 fundraiser!
Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsBooks & Magazines
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryMineral Photography


This page is currently not sponsored. Click here to sponsor this page.
Hide all sections | Show all sections

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:
7 photos of Crookesite associated with CalciteCaCO3
6 photos of Crookesite associated with BukoviteTl2(Cu,Fe)4Se4
2 photos of Crookesite associated with BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
2 photos of Crookesite associated with KlockmanniteCuSe
1 photo of Crookesite associated with BerzelianiteCu2Se

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

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.
  • La Rioja Province
    • 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.; Grundmann, G., & Förster, H. J. (2018). The Sierra de Cacheuta Vein-Type Se Mineralization, Mendoza Province, Argentina. Minerals, 8(4), 127.
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
    • Huaibei
      • 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
  • Central Bohemian Region
Škácha, P., Sejkora, J., & Plášil, J. (2017). Selenide mineralization in the Příbram uranium and base-metal district (Czech Republic). Minerals, 7(6), 91.
  • 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
    • Göttingen
      • Bad Sachsa
        • Zorge
Weiss: "Mineralfundstellen, Deutschland West", 1990
      • Osterode am Harz
        • Lerbach
Weiss: "Mineralfundstellen, Deutschland West", 1990
Sweden (TL)
  • Östergötland County
    • 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.
Mineral and/or Locality is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © and the Hudson Institute of Mineralogy 1993-2019, except where stated. Most political location boundaries are © OpenStreetMap contributors. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: October 22, 2019 10:19:27 Page generated: October 13, 2019 09:37:22
Go to top of page