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Allan Hills A78044
Basic information Name: Allan Hills A78044
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78044
This meteorite may also be called Allan Hills 78044 (ALH 78044) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 164.1 g
Antarctic Meteorite Newsletter:  AMN 4(1)  (1981)  Unclassified
AMN 4(2)  (1981)  L4
Meteoritical Bulletin:  MB 76  (1994)  L4
NHM Catalogue:  5th Edition  (2000)  L4
NIPR Catalogue:  2000 Edition  (2000)  L4
MetBase:  v. 7.1  (2006)  L4
Recommended:  L4    [explanation]

This is 1 of 2024 approved meteorites (plus 4 unapproved names) classified as L4.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeup from AMN 4(2):

Sample No. : ALHA78044

Location: Allan Hills

Field No.: 282

Weight (gms): 164.1

Meteorite Type: L4 Chondrite


Physical Description:

Patches of brown and black fusion crust cover entire specimen except for a 2 x 2 cm area on the B surface. Many clasts are visible on the exterior surfaces. Several fractures penetrate the interior of the stone. Chipping revealed an interior that is mostly weathered. Dark gray inclusions up to 2 mm in diameter are visible in the unweathered light gray matrix. Dimensions: 6.5 x 4 x 3.5 cm.


Petrographic Description: Brian Mason

The section shows a closely-packed aggregate of chondrules, 0.3-2.4 mm across; a variety of chondrule types is present, the commonest being granular and porphyritic olivine, barred olivine, and radiating and fine-grained pyroxene. The matrix consists of fine-grained olivine and pyroxene and minor subequal amounts of nickel-iron and troilite. The meteorite is considerably weathered, with limonitic staining throughout and areas of red-brown limonite associated with the metal grains. Microprobe analyses show slightly variable olivine composition (Fa23-25, average Fa14) and moderately variable pyroxene (Fs19-24, average Fs21). The meteorite is classified as an L4 chondrite.

Data from:
  Table 2
  Line 287:
Origin or pseudonym:Main icefield
Mass (g):164.1
Weathering grade:B/C
Fayalite (mol%):23-25
Ferrosilite (mol%):19-24
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References: Published in Antarctic Meteorite Newsletter 4(2) (1981), 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 43857 approved meteorites from Antarctica (plus 3802 unapproved names)
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