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| Allan Hills A77144 | |||||||||||||||||||||||||
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| Basic information | Name: Allan Hills A77144 This is an OFFICIAL meteorite name. Abbreviation: ALHA77144 This meteorite may also be called Allan Hills 77144 (ALH 77144) in publications. Observed fall: No Year found: 1977 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass:  7.9 g | ||||||||||||||||||||||||
| Classification history: |
This is 1 of 6205 approved meteorites (plus 5 unapproved names) classified as H6. [show all] Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||
| Writeup |
Writeup from AMN 4(1):
Sample No.: ALHA77144 Location: Allan Hills Field No.: 77123106 Weight (gms): 7.88 Meteorite Type: H6 Chondrite
Physical Description: The specimen is rounded with a thin, patchy fusion crust covering ~75% of the stone's surface. The remainder of the stone is covered by a reddish-brown weathering rind. This appears to be a complete specimen. Its maximum dimension is ~2 cm. After chipping it was determined that the meteorite is weathered throughout.
Petrographic Description: Brian Mason Chondritic structure not prominent, the rather sparse chondrules merging with the granular groundmass, which consists of olivine, pyroxene, nickel-iron, and troilite, with accessory chromite. A moderate amount of limonitic staining is concentrating around nickel-iron grains. Fusion crust is present on one edge. Microprobe analyses show olivine (Fa19) and orthopyroxene (Fs17) of uniform composition; medium-grained sodic plagioclase was also seen. | ||||||||||||||||||||||||
| Data from: MB76 Table 2 Line 113: |
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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:
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Statistics: This is 1 of 40849 approved meteorites from Antarctica (plus 4494 unapproved names) | ||||||||||||||||||||||||
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