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A model for the irradiative coloration of smoky feldspar and the inhibiting influence of water

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Abstract

Radiation-induced smoky color and associatedelectron paramagnetic resonance (EPR) signals develop only in potassium feldspar (KAlSi3O8) free of structurally bound molecular water. Fluid inclusion water does not influence coloration. The integrated intensity of each of the four bands (11,600, 16,200, 19,100, and 27,200 cm−1) in the optical absorption spectra are linearly correlated with the doubly-integrated intensity of a broad, asymmetric first derivative atg eff=2.027 in EPR spectra. In microcline, the EPR pattern is resolved into an asymmetric six-line pattern atg eff=2.024 and a single derivative atg eff=2.009 which, based on analogy to alkali-silicate glass, are due respectively to [SiO4/K+]2+ and a hole shared between two nonbonding oxygens on Si. We propose that structural water inhibits formation of smoky centers in feldspar by releasing atomic hydrogen during irradiation which destroys centers while diffusing towards a stable site.

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Author notes

  1. Anne M. Hofmeister

    Present address: Geophysical Laboratory, Carnegie Institution of Washington, 20008, Washington, DC, USA

Authors and Affiliations

  1. Division of Geological and Planetary Sciences, California Institute of Technology, 91125, Pasadena, CA, USA

    Anne M. Hofmeister & George R. Rossman

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  1. Anne M. Hofmeister
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  2. George R. Rossman
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Contribution No. 3984

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Hofmeister, A.M., Rossman, G.R. A model for the irradiative coloration of smoky feldspar and the inhibiting influence of water. Phys Chem Minerals 12, 324–332 (1985). https://doi.org/10.1007/BF00654342

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  • DOI: https://doi.org/10.1007/BF00654342

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