Lafayette meteorite - Petrology and opaque mineralogy

Details Lafayette meteorite - Petrology and opaque mineralogy Lafayette meteorite - Petrology and opaque mineralogy

Sep 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..32...69b&link_type=abstract

Earth and Planetary Science Letters, vol. 32, no. 1, Sept. 1976, p. 69-76.

Computer Science

9

Achondrites, Meteoritic Composition, Mineralogy, Petrology, Glass, Olivine, Opacity, Pyroxenes, Silicates

Scientific paper

The Lafayette meteorite is a calcium-rich achondrite composed predominantly of cumulus clinopyroxene with minor iron-rich olivine and rare interstitial feldspar. The opaque oxide minerals are magnetite-ilmenite intergrowths, an apparently homogenous Cr-rich titaniferous magnetite, and discrete ilmenite. Pyrite, the major sulfide mineral, occasionally displays lamellar intergrowths of marcasite that appear to be of primary origin. Troilite occurs as inclusions in ilmenite or interstitial to the silicate minerals. Bulk chemical composition of the glass in the fusion crust is comparable with that of the Nakhla meteorite. The glass contains abundant skeletal crystals of magnetite as well as very rare, zoned magnetite grains with rims enriched in Mg and depleted in Ti relative to the cores. Although no brecciation is visible in the Lafayette meteorite, the presence of deformed twin lamellae in the clinopyroxene indicates some deformation has occurred.

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