Antarctic Search for Meteorites (ANSMET) Search this
Place:
Antarctica
Collection Date:
1987
Notes:
# NASA data for MAC 87303 Weathering: A/B Fracturing: A Pairing: MAC 87302 Fa: 24 mol % Fs: 20 mol % NTL: 5 ± 2 krad
MAC87302 is rounded and 87303 is angular and these do not fit together, but macroscopically these two rocks are identical. Matrix is light-gray and inclusions are mostly light-colored. Some of the larger clasts are angular and appear to be clasts of ordinary chondrite material. The rest are clearly chondrules. There are small pockets of sulfide about 3-5 mm across as well as smaller grains disseminated throughout.
These sections are very similar in all respects and the meteorites are almost certainly paired. Chondrules and chondrule fragments are abundant, up to 2.4 mm across, but their margins tend to merge with the finely granular matrix, which consists of olivine and pyroxene with minor amounts of nickel-iron and troilite. Microprobe analyses give the following compositions: olivine, Fa₂₄; pyroxene, Fs₂₀. The meteorites are L4 chondrites.
