Important Update News

The RRUFF Project is being updated to improve its interface and content. The beta version of the update is accessible to the public at RRUFF.net. New data is only being added to the beta site. Please note that it is in development, and some components are not functional. Existing RRUFF.info links will resolve to the new site after RRUFF.net is officially released.

We are grateful to NASA for the funding of this effort.

Crookesite R061025
Name: Crookesite
RRUFF ID: R061025
Ideal Chemistry: Cu7TlSe4
Locality: Skrikerum mine, Ostergotland, Sweden
Source: Michael Scott S101468 [view label]
Owner: RRUFF
Description: Lead gray metallic massive associated with umangite
Status: The identification of this mineral is confirmed by single-crystal X-ray diffraction and chemical analysis.
CHEMISTRY 
RRUFF ID: R061025.2
Sample Description: Microprobe Fragment
Measured Chemistry: Cu7.01Tl0.99Se4.00 ; (light phase) Tl not measured but estimated by difference and stoichiometry ; the dark phase is Cu3.00Se2.00 (umangite, with trace amounts of S)
Microprobe Data File: [ Download Excel File ]
RAMAN SPECTRUM 
RRUFF ID:
Sample Description: Unoriented sample
DOWNLOADS:

  To download sample data,
  please select a specific
  orientation angle.
Direction of polarization of laser relative to fiducial mark:
X Min:    X Max:    X Sort:
BROAD SCAN WITH SPECTRAL ARTIFACTS
RRUFF ID: R061025
Wavelength:
Sample Description: Unoriented sample
Instrument settings: Thermo Almega XR 532nm @ 100% of 150mW
DOWNLOADS:

Raman Data (RAW) View Graph
RRUFF File
POWDER DIFFRACTION 
RRUFF ID: R061025.9
Sample Description: Single crystal, powder profile is calculated
Cell Refinement Output: a: 10.414(8)Å    b: 10.414(8)Å    c: 3.927(2)Å
alpha: 90°    beta: 90°    gamma: 90°   Volume: 425.9(3)Å3    Crystal System: tetragonal
  File Type Information Close
Calculated diffraction file.

  File Type Information Close
Output file from the Bruker D8 Advance instrument. Includes device headers and XY data.

DOWNLOADS:

DIF File
X-ray Data (XY - RAW) View Graph
RRUFF File
X Min:    X Max:    X Sort:
REFERENCES for Crookesite

American Mineralogist Crystal Structure Database Record: [view record]

Anthony J W, Bideaux R A, Bladh K W, and Nichols M C (1990) Handbook of Mineralogy, Mineral Data Publishing, Tucson Arizona, USA, by permission of the Mineralogical Society of America. [view file]

Nordenskiöld A E (1867) Sur les minéraux sélénifères et thallifères de Skrikerum, Bulletin Mensuel de la Société Chimique de Paris, 7, 409-414   [view file]

Earley J W (1950) Description and synthesis of the selenide minerals, American Mineralogist, 35, 337-364   [view file]

Berger R A (1987) Crookesite and sabatierite in a new light - A crystallographer's comment, Zeitschrift für Kristallographie, 181, 241-249   [view file]

Johan Z (1987) La crookesite, TlCu7Se4: nouvelles données et isotypie avec NH4Cu7S4, Comptes Rendus de l'Académie des Sciences de Paris, 304, 1121-1124

Jambor J L, Bladh K W, Ercit T S, Grice J D, Grew E S (1988) New mineral names, American Mineralogist, 73, 927-935   [view file]

Jambor J L, Burke E A J (1989) New mineral names, American Mineralogist, 74, 1399-1404   [view file]

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