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Allan Hills A78042
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:help 214 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 3(2)  (1980)  L6
Meteoritical Bulletin:  MB 76  (1994)  L6
NHM Catalogue:  5th Edition  (2000)  L6
NIPR Catalogue:  2000 Edition  (2000)  L6
MetBase:  v. 7.1  (2006)  L6
Recommended:  L6    [explanation]

This is 1 of 10992 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)
Writeuphelp
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:
Origin or pseudonym:Main icefield
Mass (g):214.1
Class:L6
Weathering grade:B
Fayalite (mol%):24
Ferrosilite (mol%):20
Comments:26Al=45±2
Catalogs:
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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:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 43'S, 159° 40'E)

Statistics:
     This is 1 of 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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