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Allan Hills A77011 | |||||||||||||||||||||||||||||
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Basic information | Name: Allan Hills A77011 This is an OFFICIAL meteorite name. Abbreviation: ALHA77011 This meteorite may also be called Allan Hills 77011 (ALH 77011) in publications. Observed fall: No Year found: 1977 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass: 292 g | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 95 approved meteorites classified as L3.5. [show all] Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3) | ||||||||||||||||||||||||||||
Writeup |
Writeup from AMN 3(1):
This text was reprinted from AMN 3(1) in AMN 4(1). In some cases, it may be an updated version from the original. Sample No.: ALHA77011 Location: Allan Hills Field No.: 77122937 Weight (gms) 291.5 Meteorite Type: LL-3 Chondrite
Physical Description: The major portion of the sample is covered with fusion crust. Inclusions are apparent through the thin fusion crust on the B surface. The fusion crust on the T surface is shiny blackish-red and appears to be more severely weathered than the other surfaces. Regmaglypts are present on the E surface. In areas where the fusion crust has been removed, probably by physical processes, many inclusions are apparent in the interior of the stone.
Petrographic Description: Brian Mason Chondrules are numerous and well developed, 0.2-1.2 mm in diameter, and are close-packed with only a small amount of groundmass. Some of the chondrules have prominent dark rims. The commonest types are granular olivine and prismatic or fine-grained pyroxene. Most of the pyroxene is polysynthetically twinned clinobronzite. Nickel-iron and troilite are present in unusually small amounts; troilite is concentrated in chondrule rims. A moderate amount of limonitic staining is present. Microprobe analyses show that olivine and pyroxene vary in composition; olivine ranges from Fa4 to Fa36, with a mean of Fa16 and the pyroxene ranges from Fs1 to Fs33, with a mean of Fs12. The low content of nickel-iron and troilite suggests LL group, and the meteorite is tentatively classified as an LL3 chondrite; however, definite assignment should await further investigation. | ||||||||||||||||||||||||||||
Data from: MB76 Table 2 Line 19: |
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Catalogs: |
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References: | Published in Antarctic Meteorite Newsletter 3(1) (1980), JSC, Houston Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Geography: |
Statistics: This is 1 of 44274 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||||||
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Revision history: |
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