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Allan Hills A78043
Basic information Name: Allan Hills A78043
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78043
This meteorite may also be called Allan Hills 78043 (ALH 78043) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 680 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 10989 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.: ALHA78043

Location: Allan Hills

Field No.: 264

Weight (gms): 680.0

Meteorite Type: L6 Chondrite

 

Physical Description:

The sample is approximately 10.0 x 8.5 x 6.0 cm., and covered with a black fusion crust, ~1 mm. thick, that has some weathering. The W surface appears to be less weathered than the remaining surfaces. A large chondrule is present on the B surface. The T surface is a fracture surface with some remnant patches of fusion crust present. The matrix of the sample is yellowish green with some small (<3 mm.) clasts apparent. During processing the sample broke along previously existing fractures, which were weathered and stained by iron oxidation. Only a few metallic flecks were present in the greenish-gray to orangish matrix 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. ALHA 78043 is an L6 chondrite similar in all respects to ALHA 78045.

Data from:
  MB76
  Table 2
  Line 286:
Origin or pseudonym:Main icefield
Mass (g):680
Class:L6
Weathering grade:B
Fayalite (mol%):25
Ferrosilite (mol%):21
Comments:26Al=38±3; NTL=11.0±0.1; 78043 pairing group
Catalogs:
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Search for this meteorite in the NASA/JSC database (U.S.):   
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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