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| Allan Hills A77124 | |||||||||||||||||||||||||||||
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| Basic information | Name: Allan Hills A77124 This is an OFFICIAL meteorite name. Abbreviation: ALHA77124 This meteorite may also be called Allan Hills 77124 (ALH 77124) in publications. Observed fall: No Year found: 1977 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass:  4.4 g | ||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 10193 approved meteorites (plus 18 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 4(1):
Sample No.: ALHA77124 Location: Allan Hills Field No.: 77123119 Weight (gms): 4.41 Meteorite Type: H5 Chondrite
Physical Description: Specimen is rounded and nearly completely covered with a thin, weathered fusion crust. From field photographs it is known that the B surface was in contact with the ice. The maximum dimension of the specimen is ~1.5 cm. No fresh metal was observed when the sample was chipped to obtain a thin section sample.
Petrographic Description: Brian Mason Chondrules sparse and not easily distinguished from the granular groundmass, which consists of olivine, pyroxene, nickel-iron, and troilite; accessory chromite is present. Yellow-brown limonitic staining pervades the section. Fusion crust is present on one edge. Microprobe analyses show olivine (Fa19) and orthopyroxene (Fs16) of uniform composition; grains of sodic plagioclase were detected. | ||||||||||||||||||||||||||||
| Data from: MB76 Table 2 Line 97: |
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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 40719 approved meteorites from Antarctica (plus 4494 unapproved names) | ||||||||||||||||||||||||||||
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