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Co-described with jolliffeite. Found as small, discrete, anhedral grains, with clausthalite and some unidentified selenides of Bi and Pb-Bi-Ag, within 'pitchblende'.

Optically quite similar to jolliffeite. Could represent a Se analogue of either cobaltite or glaucodot.

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Classification of UM1991-19-Se:AsCoHide

Unnamed (probably valid)

Optical Data of UM1991-19-Se:AsCoHide

slightly more anisotropic than jolliffeite

Chemical Properties of UM1991-19-Se:AsCoHide


X-Ray Powder DiffractionHide

Powder Diffraction Data:
the pattern couldn't be indexed; it differs from that of synthetic CoAsSe

Synonyms of UM1991-19-Se:AsCoHide

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 UM1991-19-Se:AsCoHide

Reference List:
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Cabri, L.J., Laflamme, J.H.G., Roberts, A.C., Criddle, A.J., Hulbert, L.J. (1991): Jolliffeite and unnamed CoAsSe; two new arsenoselenides from the north shore of Lake Athabasca, Saskatchewan. Can. Min.: 29: 411-418
Smith, D.G.W., Nickel, E.H. (2007): A System of Codification for Unnamed Minerals: Report of the SubCommittee for Unnamed Minerals of the IMA Commission on New Minerals, Nomenclature and Classification. Canadian Mineralogist: 45: 983-1055; (2016)

Internet Links for UM1991-19-Se:AsCoHide

Localities for UM1991-19-Se:AsCoHide

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.
  • Saskatchewan
    • Beaverlodge Lake area
      • Black Bay Uranium Mines
Cabri, L.J., Laflamme, J.H.G., Roberts, A.C., Criddle, A.J., Hulbert, L.J. (1991) Jolliffeite and unnamed CoAsSe: two new arsenoselenides from the north shore of Lake Athabasca, Saskatchewan. Canadian Mineralogist: 29: 411-418.
  • Drâa-Tafilalet Region
Vinogradova, R. A.; Uljanov, A. A.; Korotaeva, N. N.; Obraztsov, V. V.; Azizi, S. M. R.; Maasha, L. (1994): Selenium-bearing sulfarsenides of the cobaltite-gersdorffite series from deposits of Bu-Azzer district (Morocco). Zapiski Vserossiiskogo Mineralogicheskogo Obshchestva 123, 64-68 (in Russian).
Mineral and/or Locality  
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