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X-radiography of slices of the Allende MeteoriteA 2.2 kg fragment of the Allende Meteorite was derinded and sliced by bandsawing. Several X-radiographs were made of all slices. The following features are resolved: grains of blocky troilite (bright spots), troilite rimmed chondrules (bright halos), chondrules with central vugs (dim halos), white aggregates (dark patches), and dark inclusions (medium dark patches). The number of FeS grains larger than about 0.5 mm is one per 6 + or - 1 gram of this fragment. Their concentration appears to be uniform at the 1 kg weight level, but is not uniform at the 100 g level. The number of FeS rimmed chondrules is one per 10 g. Their concentration is also nonuniform at the 100 g weight level. The number of white aggregates is roughly one per 20 g. These disc shaped objects show a distinct preferred orientation of the axis orthogonal to the plane of the disc. Chondrules with central vugs are numerous. Linear and curved arrays of chondrules, up to a few cm long, were observed. An interpretation of the observed features is given.
Document ID
19850007313
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Smith, M. J.
(Rice Univ. Houston, TX, United States)
Anderson, J. B.
(Rice Univ. Houston, TX, United States)
Heymann, D.
(Rice Univ. Houston, TX, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1984
Publication Information
Publication: Lunar and Planetary Institute The 47th Ann. Meteoritical Soc. Meeting
Subject Category
Lunar And Planetary Exploration
Accession Number
85N15622
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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