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Spectral chemistry of green glass-bearing 15426 regolithThe detection of appreciable concentrations of ferric iron in a synthetic green glass equilibrated at an oxygen fugacity of 10 to the -11th atm prompted a Moessbauer spectral study of pristine emerald-green glass spherules carefully handpicked from regolith sample 15426. No Fe(3+) ions were detected in this lunar sample or in a synthetic green glass simulant equilibrated at fO2 = 10 to the -14th atm, suggesting that the green glass clods in rock 15426 formed under conditions of correspondingly low oxygen fugacities. The Moessbauer spectra indicated the presence of olivine crystallites in the lunar emerald green glass spherules. Measurements of homogeneous and partially devitrified synthetic silicate glasses revealed that significant changes of coordination environment about Fe(2+) ions in the glass structure occur during crystallization of olivine crystals from the melt.
Document ID
19840035682
Document Type
Reprint (Version printed in journal)
Authors
Burns, R. G.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Dyar, M. D.
(MIT Cambridge, MA, United States)
Date Acquired
August 12, 2013
Publication Date
November 15, 1983
Publication Information
Publication: Journal of Geophysical Research, Supplement
Volume: 88
ISSN: 0148-0227
Subject Category
Astronomy
Accession Number
84A18469
Funding Number(s)
CONTRACT_GRANT: NSG-7604
Distribution Limits
Public
Copyright
Other

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