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Optics of hexagonal pyrrhotine (~Fe9S10)

Published online by Cambridge University Press:  14 March 2018

Kurt von Gehlen  and
Horst Pillier
Kurt von Gehlen
Affiliation:
Mineralogisches Institut, University of Erlangen-Nürnberg, Erlangen, Germany
Horst Pillier
Affiliation:
Laboratory of Microscopy, Firma Carl Zeiss, 0berkochen, Germany
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Summary

Reflectivities of a series of oriented polished sections through a single crystal of pyrrhotine (Fe1−αS) from Trepča, Yugoslavia, were measured by means of a spectral photometer attached to a microscope. This pyrrhotine consists of two phases, namely intermediate pyrrhotine (∼ Fe9S10) and monoclinic pyrrhotine (∼ Fe7S8), which were probably formed by exsolution. The phase relations of pyrrhotine at low temperatures are discussed. Optical data are given for the intermediate pyrrhotine from 440 to 660 mµ. From the reflectivities measured in air and oil against a carborundum standard, values of n, k, and κ were calculated for ω and ε and represented in dispersion curves. Also, sections through the various ‘indicating surfaces’ at 546 mµ are shown. The accuracy of the values, which should be approximately the same for other pyrrhotine phases, is discussed.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 35 , Issue 270 , June 1965 , pp. 335 - 346
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1965

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