Hyperfine Interactions

, Volume 84, Issue 1, pp 427–431 | Cite as

Characterization of natural chromite ((Mg,FeII)(Al,FeIIICr)2O4) samples from the Bushveld Complex, South Africa

  • J. Nell
  • H. Pollak


Fe3+/Fe2+ ratios were determined for a suite of chromite samples from the Bushveld Complex, South Africa, using57Fe Mössbauer spectroscopy and a ceric sulphate titration method. Two distinctly different types of chromite were identified. Type I chromites have low Fe3+/Fe2+ ratios (between 0.2 and 0.4), and contain 3 cations for every 4 oxygen ions in the chemical formula unit. Type II chromites, on the other hand, have Fe3+/Fe2+ ratios between 0.7 and 1.3, and contain considerably less than 3 cations per 4 oxygen ions in the formula unit. Type II chromites result from the oxidation of type I chromites and can be reduced back to the latter by heating in a gas mixture containing 1% CO and 99% CO2 at 1000 °C.


Oxidation Oxygen Sulphate Spectroscopy Thin Film 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. [1]
    R.E. Vandenberghe and E. De Grave, in:Mössbauer Spectroscopy Applied to Inorganic Chemistry, eds. G.J. Long and F. Grandjean (Plenum Press, New York, 1989) p. 59.Google Scholar
  2. [2]
    G.A. Fatseas and J.L. Dormann, J. de Phys. 6-C6(1976)787.Google Scholar
  3. [3]
    S. Mitra, T. Pal and T. Pal, Min. Mag. 55(1991)535.Google Scholar
  4. [4]
    M. Robbins, G.K. Wertheim, R.C. Sherwood and D.N.E. Buchanan, J. Phys. Chem. Solids 32(1971)717.Google Scholar
  5. [5]
    B.J. Wood and D. Virgo, Geochim. Cosmochim. Acta 53(1989)1277.Google Scholar
  6. [6]
    E. De Grave, C. Dauwe, J. De Sitter and A. Govaert, J. de Phys. 37-C6(1976)497.Google Scholar
  7. [7]
    R. Vanleerberghe and R.E. Vandenberghe, Hyp. Int. 23(1985)75.Google Scholar
  8. [8]
    M.D. Osborne, M.E. Fleet and G.M. Bancroft, Contrib. Mineral Petrol. 77(1981)251.Google Scholar
  9. [9]
    R. Dieckmann, Ber. Bun. Phys. Chem. 86(1982)112.Google Scholar

Copyright information

© J.C. Baltzer AG, Science Publishers 1994

Authors and Affiliations

  • J. Nell
    • 1
  • H. Pollak
    • 2
  1. 1.Mineralogy and Process Chemistry DivisionMintekRandburgSouth Africa
  2. 2.Department of PhysicsUniversity of the WitwatersrandJohannesburgSouth Africa

Personalised recommendations