Antarctic Search for Meteorites (ANSMET) Search this
Place:
Antarctica
Collection Date:
1988
Notes:
# NASA data for LEW 88679 Weathering: B/C Fracturing: A Fa: 30 mol % Fs: 26 mol %
Thin shiny fusion crust covers most of LEW88679. Areas of light brown oxidation scattered throughout the gray matrix give the interior a mottled appearance. Single crystals of pyroxene were noted.
The section consists almost entirely of anhedral grains of pyroxene, up to 6 mm across; under crossed polars they show undulose extinction. Accessory amounts of isotropic plagioclase (maskelynite?) are present, as rounded grains 0.1-0.6 mm across; one grain of olivine was seen. Microprobe analyses show that the pyroxene has a fairly uniform composition, mean Wo₃Fs₂₆, With CaO 1.4-2.0%, Al₂O₃ 0.9-1,1%- Plagioclase composition is An₉₂; olivine composition is Fa₃₀. The meteorite is a diogenite. It lacks the cataclastic texture of the other LEW diogenites (88008 and 88011).
