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| Allan Hills A78045 | |||||||||||||||||||||||||
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| Basic information | Name: Allan Hills A78045 This is an OFFICIAL meteorite name. Abbreviation: ALHA78045 This meteorite may also be called Allan Hills 78045 (ALH 78045) in publications. Observed fall: No Year found: 1978 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass:  397 g | ||||||||||||||||||||||||
| Classification history: |
This is 1 of 12206 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(2):
This text was reprinted from AMN 3(2) in AMN 4(1). In some cases, it may be an updated version from the original. Sample No.: ALHA78045 Location: Allan Hills Field No.: 263 Weight (gms): 396.5 Meteorite Type: L6 Chondrite
Physical Description: The sample is approximately 8.5 x 5.0 x 5.0 cm. and tabular. The blackish-brown fusion crust covers the complete sample with the exception of an 2.5 x 3.5 cm. area on the T/E surfaces which is highly polished and very smooth. In three areas the fusion crust has been removed revealing matrix material that is reddish-yellow. Three large fractures penetrate the sample. During processing the specimen was cleaved along one of the fractures and broke into two approximately equal pieces, revealing no unoxidized material.
Petrographic Description: Brian Mason The section shows sparse chondrules with diffuse margins, tending to merge with the granular groundmass, which consists of olivine and pyroxene with minor subequal amounts of nickel-iron and troilite, a little plagioclase, and accessory chromite. Minor limonitic staining is present around nickel-iron grains. Well-preserved fusion crust 0.5 mm thick is present along one edge. Microprobe analyses give the following compositions: olivine Fa25; pyroxene, Fs21; plagioclase, An10; accessory merrillite was identified with the microprobe. The meteorite is an L6 chondrite. ALHA78045 is an L6 chondrite similar in all respects to ALHA 78043. | ||||||||||||||||||||||||
| Data from: MB76 Table 2 Line 288: |
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| References: | Published in Antarctic Meteorite Newsletter 3(2) (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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