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Allan Hills A78131
Basic information Name: Allan Hills A78131
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78131
This meteorite may also be called Allan Hills 78131 (ALH 78131) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 269 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.: ALHA78131

Location: Allan Hills

Field No.: 404

Weight (gms): 268.8

Meteorite Type: L6 Chondrite


Physical Description:

A thin, shiny black fusion crust covers the specimen, with the exceptions of most of T surface and portions of the N and B surfaces. Shallow regmaglypts are present on the S, W, and T surfaces. The surfaces that are devoid of fusion crust are weathered and stained by iron-oxidation and range texturally from smooth to rough on a centimeter scale. Several light colored clasts are present on the surfaces devoid of fusion crust. No fractures are present en the sample. When the meteorite was cleaved during processing, only a small amount of unweathered material was exposed.


Petrographic Description: Brian Mason

Chondrules are sparse and poorly defined, their borders tending to merge with the granular groundmass, which consists largely of olivine and pyroxene with minor subequal amounts of nickel-iron and troilite, plagioclase, and accessory chromite. A moderate amount of brown limonitic staining is present around the nickel-iron grains. Microprobe analyses give the following compositions: olivine, Fa25; pyroxene, Fs21; plagioclase, An10. The meteorite is an L6 chondrite. ALHA78130, 78131 are L6 chondrites similar in all respects to ALHA78126.

Data from:
  Table 2
  Line 354:
Origin or pseudonym:Main icefield
Mass (g):268.8
Weathering grade:B/C
Fayalite (mol%):25
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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