Mössbauer study of mineral glasses: East rhodope perlites
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Several perlites of different colours originating from east Rhodope (Bulgaria) have been studied by Mössbauer spectroscopy. Several types of iron are revealed (i) paramagnetic Fe2+ and Fe3+ down 4.2K which correspond to iron dispersed into the glass matrix (ii) small aggregates of Fe2+ and hematite in colloidal type phase with superparamagnetic properties (iii) large aggregates and microlites of hematite and magnetite. Alteration effects and colour problem are discussed.
KeywordsColour Iron Spectroscopy Thin Film Magnetite
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