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Measurements of spectral reflectivity of manganese oxides

Published online by Cambridge University Press:  14 March 2018

Ian Nichol  and
Roy Phillips
Ian Nichol
Affiliation:
University of Durham, and Department of Applied Geochemistry, Imperial College
Roy Phillips
Affiliation:
Department of Geology, University of Durham
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Summary

An accurate and highly sensitive method for the measurement of reflectivities incorporating a photomultiplier and a direct-reading galvanometer is described. The high sensitivity of the technique permits the determination of spectral reflectivities as opposed to ‘white’ light reflectivities, the latter values being subject to variation according to the type of apparatus used in their determination. The absolute spectral reflectivities of pyrite determined by the method are in good agreement with those quoted by some previous workers. Spectral reflectivities in air and oil and refractive and absorption indices are given for wavelengths from 430–650 mµ for manganese oxide minerals.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 35 , Issue 269 , March 1965 , pp. 200 - 213
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1965

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