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| Allan Hills A77268 | |||||||||||||||||||||
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| Basic information | Name: Allan Hills A77268 This is an OFFICIAL meteorite name. Abbreviation: ALHA77268 This meteorite may also be called Allan Hills 77268 (ALH 77268) in publications. Observed fall: No Year found: 1977 or 1978 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass:  272 g | ||||||||||||||||||||
| Classification history: |
This is 1 of 11567 approved meteorites (plus 23 unapproved names) classified as H5. [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(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.: ALHA77268 Location: Allan Hills Field No.: Y78010311 Weight (gms): 272.0 Meteorite Type: H5 Chondrite
Physical Description: - This appears to be a complete specimen with dull black fusion crust on all surfaces. One small area of material with an iridescent sheen is present on the T surface. A large fracture penetrates the entire stone. No unweathered material was exposed in the meteorite during processing.
Petrographic Description: Brian Mason Chondritic structure is well developed; chondrules range from 0.3-1.8 mm in diameter, some being broken or irregular in form. The usual types of chondrules are present, the commonest being granular and porphyritic olivine and fine-grained pyroxene. The groundmass consists of fine-grained olivine and pyroxene, with minor amounts of nickel-iron and troilite (nickel-iron in excess of troilite); it is extensively veined with red-brown limonite. Microprobe analyses show olivine (Fa18) and pyroxene (Fs16) of uniform composition. The meteorite is classified as an H5 chondrite. | ||||||||||||||||||||
| Data from: MB76 Table 2 Line 219: |
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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:
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Statistics: This is 1 of 44543 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||
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| Revision history: |
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