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Thin Sections
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5.316 kg. 22 x 16 x 9 cm. Ureilite Fall not observed. Found 1982 in Antarctica.Location Map of Antarctic FindsAMN writes:Macroscopic Description - Carol Schwarz Patches of fusion crust cover 75% of this achondrite. In some areas the fusion crust has a blistery texture. Areas with little fusion crust are greenish to brown in color. The interior is grayish-green to brown in color. The matrix has a blocky texture and many crystal faces are evident. Thin Section Description - Brian Mason The section shows an aggregate of anhedral to subhedral grains (0.6-3 mm across) of olivine and pyroxene. Individual grains are rimmed by carbonaceous material which includes thin stringers of troilite. Trace amounts of nickel-iron originally present have been largely weathered to limonite. Microprobe analyses show olivine of uniform composition (Fa21) with notable high CaO content (0.3%); the pyroxene is pigeonite with composition Wo6Fs18En76. The meteorite is a ureilite; some grains show undulose extinction but apart from that the meteorite appears to be relatively unshocked compared to most ureilites.
Macroscopic Description - Carol Schwarz Patches of fusion crust cover 75% of this achondrite. In some areas the fusion crust has a blistery texture. Areas with little fusion crust are greenish to brown in color. The interior is grayish-green to brown in color. The matrix has a blocky texture and many crystal faces are evident. Thin Section Description - Brian Mason The section shows an aggregate of anhedral to subhedral grains (0.6-3 mm across) of olivine and pyroxene. Individual grains are rimmed by carbonaceous material which includes thin stringers of troilite. Trace amounts of nickel-iron originally present have been largely weathered to limonite. Microprobe analyses show olivine of uniform composition (Fa21) with notable high CaO content (0.3%); the pyroxene is pigeonite with composition Wo6Fs18En76. The meteorite is a ureilite; some grains show undulose extinction but apart from that the meteorite appears to be relatively unshocked compared to most ureilites.
Patches of fusion crust cover 75% of this achondrite. In some areas the fusion crust has a blistery texture. Areas with little fusion crust are greenish to brown in color. The interior is grayish-green to brown in color. The matrix has a blocky texture and many crystal faces are evident.
The section shows an aggregate of anhedral to subhedral grains (0.6-3 mm across) of olivine and pyroxene. Individual grains are rimmed by carbonaceous material which includes thin stringers of troilite. Trace amounts of nickel-iron originally present have been largely weathered to limonite. Microprobe analyses show olivine of uniform composition (Fa21) with notable high CaO content (0.3%); the pyroxene is pigeonite with composition Wo6Fs18En76. The meteorite is a ureilite; some grains show undulose extinction but apart from that the meteorite appears to be relatively unshocked compared to most ureilites.