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Chromian spinels from Apollo 14 rocks.Results of electron microprobe analysis of 13 pink, isotropic, high-relief grains from Apollo 14 elastic rock 14063,14 and a lithic fragment from the 1 to 2 mm fines, 14002,7, identifying them as spinel minerals dominated by the spinel component MgAl2O4 associated with a moderate content of chromite and hercynite. The spinel is thought to have crystallized from a magma high in aluminum and low in iron, with possible crystal separation, followed by incorporation in clastic rocks by impacts. Many bulk compositions of the elastic fragments fall near the field of primary spinel in the model system An-Fo-SiO2. Experimental syntheses of Apollo 14 rocks are needed to test the suggested primary origin.
Document ID
19720043447
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Steele, I. M.
(Chicago, University Chicago, Ill., United States)
Date Acquired
August 6, 2013
Publication Date
March 1, 1972
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 14
Subject Category
Space Sciences
Accession Number
72A27113
Funding Number(s)
CONTRACT_GRANT: NGL-14-001-171
Distribution Limits
Public
Copyright
Other

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