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UM1994-06-O:AlCo

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Formula:
CoAl2O4
Second natural Co-Al phase after wupatkiite.

Al analogue of cochromite; also Co analogue of spinel, hercynite, galaxite.

As a composite inclusion in a greenish-blue sapphire. The largest individual is 150 x 250 microns in diameter. Also as small euhedral crystals. Associated with a glass phase.

Electron microprobe data in wt.% (one of 16 analyses): TiO2 0.67, Al2O3 49.61, Cr2O3 11.57, FeO 9.55, MgO 6.04, CoO 22.38, total 99.82 wt%, corresponding to (Co0.523Mg0.262Fe0.233)Σ1.018(Al1.703Cr0.266Ti0.015)Σ1.984O4.


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Classification of UM1994-06-O:AlCoHide

Notes:
Unnamed (probably valid)

Chemical Properties of UM1994-06-O:AlCoHide

Formula:
CoAl2O4

Relationship of UM1994-06-O:AlCo to other SpeciesHide

Other Members of this group:

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 UM1994-06-O:AlCoHide

Reference List:
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Guo, J., Griffin, W.L., O'Reilly, S.Y. (1994): A cobalt-rich spinel inclusion in a sapphire from Bo Ploi, Thailand. Mineralogical Magazine: 58: 247-258; in: Jambor, J.L., Roberts, A.C (1995): New mineral Names. American Mineralogist: 80: 187
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; http://nrmima.nrm.se

Internet Links for UM1994-06-O:AlCoHide

Localities for UM1994-06-O:AlCoHide

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.
Thailand
 
  • Kanchanaburi Province
    • Bo Phloi District
      • Bo Phloi
Guo, J., Griffin, W.L., O'Reilly, S.Y. (1994): A cobalt-rich spinel inclusion in a sapphire from Bo Ploi, Thailand. Mineralogical Magazine: 58: 247-258; in: Jambor, J.L., Roberts, A.C (1994): New mineral Names. American Mineralogist: 80: 187
 
Mineral and/or Locality  
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