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| Allan Hills A77226 | |||||||||||||||||||||||||
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| Basic information | Name: Allan Hills A77226 This is an OFFICIAL meteorite name. Abbreviation: ALHA77226 This meteorite may also be called Allan Hills 77226 (ALH 77226) in publications. Observed fall: No Year found: 1977 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass:  15.32 kg | ||||||||||||||||||||||||
| Classification history: |
This is 1 of 6009 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 3(2):
This text was reprinted from AMN 3(2) in AMN 4(1). In some cases, it may be an updated version from the original. Sample No.: ALHA77226 Location: Allan Hills Field No.: 77122901 Weight (gms): 15323.0 Meteorite Type: H4 Chondrite
Physical Description: A small patch of dull black fusion crust was present on the S surface of the sample. The W surface of the specimen was concave and flow bands were present in the T-B direction. The specimen is severely fractured and during processing crumbled into many pieces. Nearly all the material exposed during processing was extensively stained by iron-oxidation. However, a few small areas on the exposed material are not as severely stained by iron oxidation and appear light gray.
Petrographic Description: Brian Mason Chondritic structure is well developed, with chondrules ranging from 0.3-1.8 mm in diameter; they are set in a fine-grained granular groundmass of olivine and pyroxene, with minor amounts of nickel-iron and troilite (nickel-iron in excess of troilite). Some of the pyroxene is polysynthetically twinned clinobronzite. Brown limonitic staining pervades the section. Microprobe analyses show olivine (Fa18) and pyroxene (Fs16) of essentially uniform composition. The meteorite is classified as an H4 chondrite. | ||||||||||||||||||||||||
| Data from: MB76 Table 2 Line 182: |
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| References: | Published in Antarctic Meteorite Newsletter 3(2) (1980), 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 40756 approved meteorites from Antarctica (plus 4494 unapproved names) | ||||||||||||||||||||||||
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