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Allan Hills A77001 | |||||||||||||||||||||||||
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Basic information | Name: Allan Hills A77001 This is an OFFICIAL meteorite name. Abbreviation: ALHA77001 This meteorite may also be called Allan Hills 77001 (ALH 77001) in publications. Observed fall: No Year found: 1977 or 1978 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass: 252 g | ||||||||||||||||||||||||
Classification history: |
This is 1 of 12668 approved meteorites (plus 8 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 4(1):
Sample No.: ALHA77001 Location: Allan Hills Field No.: 78010210A Weight (gms): 252.0 Meteorite Type: L6 Chondrite
Physical Description: Fusion crust is mainly missing. One large surface was produced by breaking after fall; complementary fragment is probably in the collection. Original surfaces are considerably weathered. Sawed surface showed unweathered metal particles to within ~1 cm of the surface. Specimen contains several cracks and appears slightly friable. One existing broken surface contained an irregular, medium gray, fine grained clast ~0.7 cm across. No clasts were noted on the sawed face.
Petrographic Description: Brian Mason Antarctic meteorite ALHA77001 is a typical L6 chondrite. Chondrules are sparse and poorly defined; maximum diameter is 1.9 mm. Major minerals are olivine (Fa25) and orthopyroxene (Wo1.7En77Fs21). About 10% of plagioclase (Ab83An11Or6) is present as untwinned birefringent grains up to 0.15 mm across. Minor phases are nickel-iron (≈8%), troilite (~6%), diopside (~4%), chromite (<1%) and merrillite (<1%). The small section examined shows no signs of shock or veining. A moderate amount of limonitic staining is present around most nickel-iron grains, none around troilite. | ||||||||||||||||||||||||
Data from: MB76 Table 2 Line 10: |
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Catalogs: |
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References: | Published in Antarctic Meteorite Newsletter 4(1) (1981), 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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