Abstract
A pyralspite garnet from an anomalously magnetic concentrate of a pegmatitic cassiterite ore has been investigated using 57Fe nuclear gamma-ray resonance spectroscopy. The quadrupole splitting and isomer shift values of 3.6 mm/s and 1.4 mm/s, respectively, are among the largest observed for Fe2+ ions and indicate a very low covalency of the dodecahedral Fe2+ — O2-bonds. These data support the more recent and lower value (10.2–10.1 kcal/ mole) of White and Moore (1972) for the CFSE of the dodecahedral Fe2+ ion and suggest that the CFSE should be a useful approximation to the site preference energy of Fe2+ for this site.
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Bancroft, G.M., Maddock, A.G., Burns, R.G.: Application of the Mossbauer effect to silicate mineralogy — I. Iron silicates of known crystal structure. Geochim. Cosmochim. Acta 31, 2219–2246 (1967)
Banerjee, S.K.: Origin of weak ferromagnetism and remanence in natural cassiterite crystal. J. Geophys. Res. 74, 3781–3795 (1969)
Bloomfield, O., Lawson, A.W. and Rey, C.: Crystal field splitting and covalent bonding in Fe2+ silicate garnets. J. Chem. Phys. 34, 749–756 (1961)
Born, L. and Zemann, J.: Calculations of internuclear separations and lattice energies in garnets. Contrib. Mineral. Petrol. 10, 2–23 (1964)
Burns, R.: Mineralogical application of crystal field theory, p. 84–86. Cambridge: Cambridge University Press 1970
Chappert, J., Frankel, R.B., Misetich, A., Blum, N.: Multiple charge states, hyperfine interactions, and relaxation processes of Fe in 57Co-doped MgO. Phys. Rev. 179, 578–589 (1969)
Evans, B.J.: Ph.D. Thesis, University of Chicago, 20–26 (1969)
Evans, B.J.: Unpublished 57Fe Mössbauer studies of natural columbites (1975)
Evans, B.J., Ghose, S., Hafner, S.S.: Hyperfine splitting of Fe57 and Mg-Fe order-disorder in orthopyroxenes (MgSiO3-FeSiO3 solid solution). J. Geol. 75, 306–322 (1967)
Grubb, P.L.C.: Private Communication (January, 1973)
Grubb, P.L.C., Hannaford, P.: Magnetism in cassiterite. Miner. Deposita 2, 148–171 (1966)
Hazony, Y.: H c -Qs-Is co-relations in octahedral iron compounds. In: Mössbauer effect methodology (I.J. Gruverman, ed.), vol. 7, p. 147–166. New York: Plenum Press 1971
Hazony, Y., Axtmann, R.C., Hurley, J.W., Jr.: Covalency effects from Mössbauer experiments on the hydrates of FeCl2. Chem. Phys. Lett. 2, 440–444 (1968)
Hodges, J.A., Dormann, J.L., Makram, A.: Electron paramagnetic resonance of Mn2+ at the three sites of yttrium aluminum garnet. Phys. Stat. Sol. 35, 53–61 (1969)
Holmes, O.G., McClure, D.S.: Optical spectra of hydrated ions of the transition metals. J. Chem. Phys. 26, 1686–1694 (1957)
Huggins, F.E.: The 3d levels of ferrous ions in silicate garnets. Am. Mineralogist 60, 316–319 (1975)
Ingalls, R.: Electric-field gradient tensor in ferrous compounds. Phys. Rev. 133, A787-A795 (1964)
Johnson, C.E.: Hyperfine interactions in Fe2+ salts. Symp. Faraday Soc. 1, 7–11 (1967)
Lyubutin, I.S., Dodokin, A.P.: Temperature dependence of the Mössbauer effect for Fe2+ in dodecahedral coordination in garnet. Sov. Phys.-Crystallogr. 15, 1091–1092 (1971)
Marfunin, A.A., Mineyeva, R.M., Mkrtchyan, A.R., Nyussik, Ya, M., Fedorov, V. Ye.: Optical and Mössbauer spectroscopy of rock-forming silicates. Intern. Geol. Rev. 11, 31–44 (1967)
Novak, G.A., Gibbs, G.V.: The crystal chemistry of silicate garnets. Am. Mineralogist 56, 791–825 (1971)
Oelkrug, D.: Absorption spectra and ligand field parameters of tetragonal 3d-transition metal fluorides. In: Structure and bonding (P. Hemmerich et al., eds), vol. 9, p. 1–27. New York-Heidelberg-Berlin: Springer 1971
Phillips, J.C.: Bonds and bands in semiconductors. New York: Academic Press 1973
Prandl, W., Wagner, F.: The orientation of the elctric field gradient and the internal magnetic field in almandine. Z. Krist. 134, 344–349 (1971)
Ramdohr, P.: Magneticcassiterite. Bull. Comm. Geol. Finlande, 196, 473–481 (1961)
Virgo, D., Hafner, S.S.: Fe2+, Mg order-disorder in heated orthopyroxenes. In: Pyroxenes and Amphiboles: Crystal Chemistry and Phase Petrology (J.J. Papike, ed.), Mineral. Soc. Am. Spec. Publ. No. 2, p. 67–82. Mineral. Soc. Am. (1969)
White, W.B., Moore, R.K.: Interpretation of the spin allowed bands of Fe2+ in silicate garnets. Am. Mineralogist 57, 1692–1710 (1972)
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Alfred P. Sloan Research Fellow.
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Evans, B.J., Sergent, E.W. 57Fe NCR of Fe phases in “magnetic cassiterites”. Contr. Mineral. and Petrol. 53, 183–194 (1975). https://doi.org/10.1007/BF00372603
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DOI: https://doi.org/10.1007/BF00372603