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| Allan Hills A78042 | |||||||||||||||||||||||||
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| Basic information | Name: Allan Hills A78042 This is an OFFICIAL meteorite name. Abbreviation: ALHA78042 This meteorite may also be called Allan Hills 78042 (ALH 78042) in publications. Observed fall: No Year found: 1978 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass:  214 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 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.: ALHA78042 Location: Allan Hills Field No.: 268 Weight (gms): 214.1 Meteorite Type: L6 Chondrite
Physical Description: The T surface of this ~5.5 x 4.5 x 5.0 cm sample has a 4 x 3 cm area where reddish black fusion crust has been preserved. The remainder of the sample is composed of fracture surfaces that are weathered reddish-brown. Sawing of the sample revealed a light gray matrix with both rounded and irregular inclusions, as much as 1 mm in diameter. The exterior margins of the sample are weathered and stained by iron-oxidation, while the interior of the sample appears relatively fresh.
Petrographic Description: Brian Mason Chondritic structure is poorly developed; the chondrules are sparse and poorly defined and tend to merge with the granular groundmass, which consists largely of olivine and pyroxene, with minor plagioclase, nickel-iron, and troilite, and accessory chromite. Some of the nickel-iron grains are unusually large, ranging up to 2.5 mm. A minor amount of brown limonitic staining is present around the nickel-iron grains. Microprobe analyses give the following compositions: olivine, Fa24; orthopyroxene, Fs20; plagioclase, An10, The meteorite is classified as an L6 chondrite. | ||||||||||||||||||||||||
| Data from: MB76 Table 2 Line 285: |
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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 40719 approved meteorites from Antarctica (plus 4494 unapproved names) | ||||||||||||||||||||||||
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