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Allan Hills A78039
Basic information Name: Allan Hills A78039
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78039
This meteorite may also be called Allan Hills 78039 (ALH 78039) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 299 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.: ALHA78039

Location: Allan Hills

Field No.: 288

Weight (gms): 299.0

Meteorite Type: L6 Chondrite


Physical Description:

The sample is totally covered with black fusion crust, with the exception of an ~4.0 x 2.5 cm. area that is devoid of fusion crust and reveals a light gray interior. The dimensions of the sample are approximately 8 x 4 x 5 cm. Cleaving the sample revealed a light gray matrix with light gray clasts. A very well defined weathering rind penetrated the sample to a depth of 1 mm. - 1 cm. Scattered areas of oxidized metal were apparent throughout the interior of the specimen.


Petrographic Description: Brian Mason

Chondrules are sparse and poorly defined, with margins that tend to merge with the granular groundmass, which consists largely of olivine and pyroxene with minor subequal amounts of nickel-iron and troilite and some plagioclase. A minor amount of limonitic staining is associated with the nickel-iron grains. Microprobe analyses show olivine (Fa24) and orthopyroxene (Fs21) of uniform composition; most of the plagioclase is stoichiometric (An11), but some has the appropriate Ca content but is considerably deficient in Na, suggesting partial conversion to maskelynite. The meteorite is classified as an L6 chondrite.

Data from:
  Table 2
  Line 282:
Origin or pseudonym:Main icefield
Mass (g):299
Weathering grade:B
Fayalite (mol%):24
Ferrosilite (mol%):21
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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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