Nicolini,K.P., Lombardi,K.C., Schreiner,W.H., Mazzaro,I., Wypych,F. and Mangrich,A.S.(2009): Evidence of weathering stages of phyllosilicates from biotite/muscovite to kaolinite, probed by EPR spectroscopy. Miner. Petrol., 97, 139-144.

『EPR分光法によって調べられた、黒雲母/白雲母からカオリナイトへのフィロ珪酸塩鉱物の風化段階の証拠』


Abstract
 We report on a paramagnetic anisotropy study of three layered phyllosilicates. The mineral samples were characterized through X-ray powder diffraction (XRPD), X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR). Based on EPR measurements of samples oriented parallel or perpendicular to the magnetic field lines, we show how the substitutional iron is transformed from Fe(II) (biotite) into Fe(III) (muscovite and kaolinite) species and from axial Fe(III) coordination sites (muscovite) to rhombic (kaolinite) sites in response to weathering』

Introduction
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