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| Allan Hills A77273 | |||||||||||||||||||||
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| Basic information | Name: Allan Hills A77273 This is an OFFICIAL meteorite name. Abbreviation: ALHA77273 This meteorite may also be called Allan Hills 77273 (ALH 77273) in publications. Observed fall: No Year found: 1977 or 1978 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass:  492 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 1(3):
This text was reprinted from AMN 1(3) in AMN 4(1). In some cases, it may be an updated version from the original. Sample No.: ALHA77273 Location: Allan Hills Field No.: Y78010511 Weight (gms): 492.0 Meteorite Type: L6 Chondrite
Physical Description: Sample is not a complete stone. Black fusion crust remains on four surfaces of the angular specimen (~50% of the sample covered) which is less than 1 mm thick. The broken surface shows a light gray, fine-grained matrix with areas of iron oxide staining. This surface is only moderately weathered and shows small cracks. Chondrules are not prominent. Approximate size: 14x6.5x5 cm.
Petrographic Description: Brian Mason Chondrules are few and poorly defined, tending to merge with the granular groundmass, which consists of subequal amounts of olivine and orthopyroxene, with minor amounts of plagioclase (~10%), nickel-iron (~8%), and troilite (~5%). Microprobe analyses show olivine (Fa24), orthopyroxene (Fs20), and plagioclase (An12) of essentially uniform composition. Limonitic staining pervades the section. | ||||||||||||||||||||
| Data from: MB76 Table 2 Line 224: |
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| References: | Published in Antarctic Meteorite Newsletter 1(3) (1978), 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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