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| Allan Hills A77180 | |||||||||||||||||||||||||
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| Basic information | Name: Allan Hills A77180 This is an OFFICIAL meteorite name. Abbreviation: ALHA77180 This meteorite may also be called Allan Hills 77180 (ALH 77180) in publications. Observed fall: No Year found: 1977 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass:  190.8 g | ||||||||||||||||||||||||
| Classification history: |
This is 1 of 12222 approved meteorites (plus 7 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 3(1):
This text was reprinted from AMN 3(1) in AMN 4(1). In some cases, it may be an updated version from the original. Sample No.: ALHA77180 Location: Allan Hills Field No.: Y77123109 Weight (gms): 190.8 Meteorite Type: L6 Chondrite
Physical Description: Remnant fusion crust remains on three surfaces of the sample. The other surfaces are fracture surfaces that are stained reddish-brown by iron oxidation. One fine grained gray inclusion, approximately 1 cm in diameter, was exposed in the sample during processing. The interior of the specimen is fine grained and light gray.
Petrographic Description: Brian Mason Chondrules are sparse and poorly defined, tending to merge with the granular groundmass, which consists of olivine and pyroxene with minor subequal amounts of nickel-iron and troilite. A little untwinned plagioclase is present. One edge of the section is bordered by remnants of fusion crust. A small amount of limonite is present, concentrated near the fusion crust. Microprobe analyses show olivine (Fa24), orthopyroxene (Fs20), and plagioclase (An10) of uniform composition; one grain of diopside (Wo48En46Fs6) was analyzed. The meteorite is classified as an L6 chondrite. | ||||||||||||||||||||||||
| Data from: MB76 Table 2 Line 144: |
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| References: | Published in Antarctic Meteorite Newsletter 3(1) (1980), 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 43700 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||
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