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Monticello - A glass-rich howarditeMonticello is a new howardite similar to Malvern in that it contains abundant (15 percent) glass fragments, which show a range of compositions from olivine-normative to quartz-normative. Like Kapoeta, it contains pyroxene grains that range up to highly magnesian compositions, Fs16. Because their pyroxenes are more magnesian than those occurring in diogenites, Monticello and Kapoeta are exceptions to the simple two-component mixing model in which howardites are considered to be mechanical mixtures of fragmented eucrites and diogenites. Monticello also contains clasts of what appear to be a cumulate eucrite and a noncumulate eucrite, as well as a radiating pyroxene chondrule from a chondrite. Monticello is a regolith breccia containing more evolved components than are usually considered in eucrite-diogenite genesis models. As such, it supports those models that involve reworking of a complex parent body crust rather than straightforward partial melting of primitive chondritic parent material.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Olsen, Edward J.
(Field Museum of Natural History, Chicago; Chicago, University IL, United States)
Dod, Bruce D.
(Mercer University Macon, GA, United States)
Schmitt, Roman A.
(Oregon State University Corvallis, United States)
Sipiera, Paul P.
(William Rainey Harper College Palatine, IL, United States)
Date Acquired
August 13, 2013
Publication Date
March 31, 1987
Publication Information
Publication: Meteoritics
Volume: 22
ISSN: 0026-1114
Subject Category
Lunar And Planetary Exploration
Accession Number
Funding Number(s)
Distribution Limits

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