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Allan Hills A78251
Basic information Name: Allan Hills A78251
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78251
This meteorite may also be called Allan Hills 78251 (ALH 78251) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 1312 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 3(1)  (1980)  L6
Meteoritical Bulletin:  MB 76  (1994)  L6
NHM Catalogue:  5th Edition  (2000)  L6
MetBase:  v. 7.1  (2006)  L6
Recommended:  L6    [explanation]

This is 1 of 11000 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(1):
This text was reprinted from AMN 3(1) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: ALHA78251

Location: Allan Hills

Field No.: Allan Camp #1

Weight (gms): 1312.0

Meteorite Type: L6 Chondrite

 

Physical Description:

The exterior of the sample is rough and irregular and macroscopically appears similar to ALHA77105. The sample is completely devoid of fusion crust. A small piece of material has been removed from the S surface, revealing a fine grained, greenish-gray interior. Metallic particles are apparent in the interior of the sample, and some oxidation of these has occurred. Oxidation haloes around metallic particles (1-10%) are also apparent on the sawed surfaces of the sample. Several fractures are apparent with iron oxidation along their margins. Dimensions: 12 x 7.5 x 10 cm.

 

Petrographic Description: Brian Mason

Chondrules are sparse and poorly defined, merging with the granular groundmass, which consists mainly of olivine and pyroxene, with minor amounts of plagioclase nickel-iron, and troilite, and accessory chromite. Limonitic staining is prominent around the nickel-iron grains. Microprobe analyses show olivine (Fa23), orthopyroxene (Fs20), and plagioclase (An10) of uniform composition. The meteorite is classified as an L6 chondrite.

Data from:
  MB76
  Table 2
  Line 431:
Origin or pseudonym:Main icefield
Mass (g):1312
Class:L6
Weathering grade:B
Fayalite (mol%):23
Ferrosilite (mol%):20
Comments:26Al=56±6; NTL=49.6±0.5
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 3(1) (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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