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Reflected light examination of Marcasite and löllingite

Auflichtoptische Untersuchungen von Markasit und Lollingit

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Summary

The reflectance spectra for the isotypic orthorhombic minerals marcasite, FeS2 and löllingite, FeAs2 have been measured in air and in immersion oil between 400 and 800 nm, and the indices of refraction and absorption indices have been calculated. Marcasite shows a practically “isotropic” behaviour of the optical constants, löllingite is characterized by a “uniaxial” optical behaviour with maximum absorption occurring perpendicular to the relatively short Fe-Fe distances.

Zusammenfassung

Die Reflexionsspektren der isotypen rhombischen Minerale Markasit FeS2 and Löllingit FeAs2 wurden in Luft and in Immersionsöl zwischen 400 and 800 nm gemessen und die Brechungsindices and Absorptionskonstanten berechnet. Markasit zeigt ein praktisch “isotropes” Verhalten der optischen Konstanten, Löllingit ist durch “einachsiges” optisches Verhalten charakterisiert, wobei maximale Absorption senkrecht zu den relativ kurzen Fe-Fe Abständen auftritt.

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Authors and Affiliations

  1. Institut für Mineralogie und Kristallographie, Universität Wien, Dr. Karl Lueger-Ring 1, A-1010, Wien, Austria

    T. Drapela &  A. Beran

  2. Atelier Drapela, St. Pöltner-Strasse 76a, A-3040, Neulengbach, Austria

    T. Drapela

Authors
  1. T. Drapela
  2. A. Beran

Additional information

Dedicated to Prof Dr. J. Zemann on the occasion of his 70th birthday

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Drapela, T., Beran, A. Reflected light examination of Marcasite and löllingite. Mineralogy and Petrology 48, 269–274 (1993). https://doi.org/10.1007/BF01163103

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  • DOI: https://doi.org/10.1007/BF01163103

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