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Allan Hills A78045
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:help 397 g
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 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 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:
  Table 2
  Line 288:
Origin or pseudonym:Main icefield
Mass (g):396.5
Weathering grade:B/C
Fayalite (mol%):25
Ferrosilite (mol%):21
Comments:26Al=34±3; 78043 pairing group
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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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     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 43'S, 159° 40'E)

     This is 1 of 43700 approved meteorites from Antarctica (plus 3802 unapproved names)
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