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| Allan Hills A77177 | |||||||||||||||||||||||||
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| Basic information | Name: Allan Hills A77177 This is an OFFICIAL meteorite name. Abbreviation: ALHA77177 This meteorite may also be called Allan Hills 77177 (ALH 77177) in publications. Observed fall: No Year found: 1977 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass:  368 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 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.: ALHA77177 Location: Allan Hills Field No.: Y77123110 Weight (gms): 368.2 Meteorite Type: H5 Chondrite
Physical Description: The sample is angular and is approximately 7.0x6.5x5.5 cm. This appears to be a whole specimen, with the exception of a 3.0x4.0 cm area, which has been chipped away. A dull, black fusion crust covers approximately 30 to 40 percent of the sample. The portion of the sample not covered with fusion crust is weathered reddish-brown. A yellowish-brown clast ~0.5 cm in diameter was observed on the W surface.
Petrographic Description: Brian Mason The thin section shows well-developed chondritic structure, with a variety of chondrule types; chondrule diameters range from 0.3-1.8 mm. The chondrules are-set in a granular matrix consisting largely of olivine and orthopyroxene, pervaded with brown limonitic staining. Minor amounts of nickel-iron and troilite are present in the matrix, nickel-iron in considerably greater amount than troilite. Microprobe analyses show olivine (Fa18) and orthopyroxene (Fs16) of uniform composition; minor plagioclase (An13) and accessory whitlockite were also identified. The meteorite is classified as an H5 chondrite. | ||||||||||||||||||||||||
| Data from: MB76 Table 2 Line 142: |
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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:
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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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