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Allan Hills A77233 | |||||||||||||||||||||||||
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Basic information | Name: Allan Hills A77233 This is an OFFICIAL meteorite name. Abbreviation: ALHA77233 This meteorite may also be called Allan Hills 77233 (ALH 77233) in publications. Observed fall: No Year found: 1977 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass: 4.09 kg | ||||||||||||||||||||||||
Classification history: |
This is 1 of 6493 approved meteorites (plus 2 unapproved names) classified as H4. [show all] Search for other: H chondrites, H 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.: ALHA77233 Location: Allan Hills Field No.: 77122913 Weight (gms): 4087.0 Meteorite Type: H4 Chondrite
Physical Description: This stone is 15.0x14.0x10.5 cm. Thin, (<1 mm) dull, black, patchy fusion crust is present on the S and E surfaces. The remainder of the stone is shiny reddish-brown. White deposits, presumably evaporites, are present in minor cracks on all exterior surfaces.
Petrographic Description: This section shows well-developed chondritic structure, the chondrules ranging from 0.2-2.8 mm in diameter; a variety of types is present, the commonest being porphyritic olivine, barred olivine, and fine-grained radiating pyroxene. The chondrules are set in a fine-grained granular groundmass consisting largely of olivine and pyroxene, with minor amounts of nickel-iron and troilite (nickel-iron in greater amount than troilite). Some of the pyroxene is polysynthetically twinned clinobronzite. Limonitic staining pervades the section, and veinlets and grains of limonite are common, generally in association with nickel-iron. Microprobe analyses show somewhat variable composition in olivine (Fa14-21, average Fa17) and pyroxene (Fs15-17, average Fs16). The meteorite is classified as an H4 chondrite. | ||||||||||||||||||||||||
Data from: MB76 Table 2 Line 188: |
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Catalogs: |
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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: |
Statistics: This is 1 of 44543 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||
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Revision history: |
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