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| Allan Hills A77148 | |||||||||||||||||||||||||
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| Basic information | Name: Allan Hills A77148 This is an OFFICIAL meteorite name. Abbreviation: ALHA77148 This meteorite may also be called Allan Hills 77148 (ALH 77148) in publications. Observed fall: No Year found: 1977 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass:  13.1 g | ||||||||||||||||||||||||
| Classification history: |
This is 1 of 6826 approved meteorites (plus 6 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.: ALHA77148 Location: Allan Hills Field No.: 77123107 Weight (gms): 13.10 Meteorite Type: H6 Chondrite
Physical Description: 75% of the sample is covered by a thin, patchy fusion crust. A reddish-brown weathering rind covers the remaining ~25% of the meteorite's surface. Rounded inclusions are visible on the fractured surface. Many large and small fissures are present. These fissures probably attributed to the severely weathered condition of the meteorite. This is not a complete specimen. Its maximum dimension is ~2.5 cm. From the field photographs it was determined that the B surface was in contact with the ice.
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. The section is extensively stained with yellow-brown limonitic material, which is also present as small patches and veinlets. Fusion crust is present on one edge. Microprobe analyses show olivine (Fa18) and orthopyroxene (Fs16) of uniform composition; medium grained sodic plagioclase was also seen. | ||||||||||||||||||||||||
| Data from: MB76 Table 2 Line 116: |
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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 44547 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||
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