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| Allan Hills A77297 | |||||||||||||||||||||
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| Basic information | Name: Allan Hills A77297 This is an OFFICIAL meteorite name. Abbreviation: ALHA77297 This meteorite may also be called Allan Hills 77297 (ALH 77297) in publications. Observed fall: No Year found: 1977 or 1978 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass:  952 g | ||||||||||||||||||||
| Classification history: |
This is 1 of 12222 approved meteorites (plus 7 unapproved names) classified as L6. [show all] Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||
| Writeup |
Writeup from AMN 2(1):
This text was reprinted from AMN 2(1) in AMN 4(1). In some cases, it may be an updated version from the original. Sample No.: ALHA77297 Location: Allan Hills Field No.: 78010210C Weight (gms): 951.6 Meteorite Type: L6 Chondrite
Physical Description: The overall shape of the specimen is oblong (12.0x7.5x6.0 cm). Shiny black, polygonally fractured fusion crust (~0.5 to l mm thick) is present on the B surface. On the B surface an area ~2 mm in diameter, possibly a partially melted chondrule, is shinier than the surrounding fusion crust. The N surface appears to be a recently fractured surface that is whitish gray with small, <1 mm inclusions. Orangish brown oxidation staining is present on all surfaces. Cleaving the meteorite in half, revealed metallic flecks, <0.5 mm in maximum diameter, that make up approximately 5% of the sample. Some haloing effects are apparent.
Petrographic Description: Brian Mason Chondrules are sparse and poorly developed, tending to merge with the granular groundmass, which consists largely of olivine and orthopyroxene, with minor sub-equal amounts of nickel-iron and troilite, and a little untwinned plagioclase. A little limonitic staining is present around some of the nickel-iron grains. Microprobe analyses show olivine (Fa24), orthopyroxene (Fs20), and plagioclase (An11) of uniform composition. The meteorite is classified as an L6 chondrite. | ||||||||||||||||||||
| Data from: MB76 Table 2 Line 247: |
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| References: | Published in Antarctic Meteorite Newsletter 2(1) (1979), JSC, Houston Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Geography:
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Statistics: This is 1 of 43700 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||
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