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Allan Hills A81023 | |||||||||||||||||||||
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Basic information | Name: Allan Hills A81023 This is an OFFICIAL meteorite name. Abbreviation: ALHA81023 This meteorite may also be called Allan Hills 81023 (ALH 81023) in publications. Observed fall: No Year found: 1981 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass: 418 g | ||||||||||||||||||||
Classification history: |
This is 1 of 8890 approved meteorites (plus 5 unapproved names) classified as L5. [show all] Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||
Writeup |
Writeup from AMN 6(1):
Sample No.: ALHA81023 Location: Allan Hills Field No.: 1427 Weight (gms): 418.3 Meteorite Type: L5 Chondrite
Physical Description: Roberta Score ALHA81023 was found on the ice in Antarctica as 2 large pieces, 2 small pieces and many tiny chips. None of the pieces fit together, but are obviously related. The matrix is light gray with many dark colored chondrules, irregular shaped inclusions and troilite(?) grains that show relief from the exterior surface. Some fusion crust is present on each piece. Weathering is moderate. A minute amount of white deposit is present on one piece.
Petrographic Description: Brian Mason Chondrules are abundant and well developed, ranging up to 2.3 mm across; a variety of types is present, including porphyritic olivine, granular olivine and olivine-pyroxene, and radiating pyroxene. They are set in a granular groundmass consisting largely of olivine and pyroxene with minor amounts of nickel-iron and troilite. Weathering is limited to brown limonitic staining around metal grains. Microprobe analyses give the following compositions: olivine, Fa25; orthopyroxene, Fs21. The meteorite is classified as an L5 chondrite; it is very similar to ALHA81017, 81018, and the possibility of pairing with these meteorites should be considered. | ||||||||||||||||||||
Data from: MB76 Table 2 Line 546: |
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Catalogs: |
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References: | Published in Antarctic Meteorite Newsletter 6(1) (1983), JSC, Houston Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Geography: |
Statistics: This is 1 of 44543 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||
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Revision history: |
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