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| Allan Hills A77150 | |||||||||||||||||||||||||
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| Basic information | Name: Allan Hills A77150 This is an OFFICIAL meteorite name. Abbreviation: ALHA77150 This meteorite may also be called Allan Hills 77150 (ALH 77150) in publications. Observed fall: No Year found: 1977 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass:  58.3 g | ||||||||||||||||||||||||
| Classification history: |
This is 1 of 11485 approved meteorites (plus 6 unapproved names) classified as L6. [show all] Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||
| Writeup |
Writeup from AMN 4(1):
Sample No.: ALHA77150 Location: Allan Hills Field No.: 77123101 Weight (gms): 58.30 Meteorite Type: L6 Chondrite
Physical Description: Maximum dimension of specimen is ~3.25 cm. Fusion crust covers the B and S surfaces, the remainder of the specimen is a fracture surface which is brownish-red. The fracture surface has a fine-grained, granular texture with some crystal faces apparent. The fissures on the fracture surface are iron oxide stained. When chipping, many very fine pieces fell off. The sample appears to be weathered throughout.
Petrographic Description: Brian Mason Chondrules are sparse-and barely distinguishable from the granular groundmass, which consists of olivine, pyroxene, nickel-iron, and troilite. The section contains a fine-grained enclave, 1.5 mm across, consisting of olivine, pyroxene and numerous minute nickel-iron grains. Yellow-brown limonitic staining is pervasive throughout the meteorite. Microprobe analyses show olivine (Fa25) and orthopyroxene (Fs22) of uniform composition; medium-grained sodic plagioclase was also seen. | ||||||||||||||||||||||||
| Data from: MB76 Table 2 Line 118: |
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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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