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Allan Hills A78112
Basic information Name: Allan Hills A78112
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78112
This meteorite may also be called Allan Hills 78112 (ALH 78112) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 2.49 kg
Classification
  history:
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 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(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.: ALHA78112

Location: Allan Hills

Field No.: 260

Weight (gms): 2485.0

Meteorite Type: L6 Chondrite

 

Physical Description:

Snow and/or ice was present on the sample, ~14 x 13 x 13 cm., when it was removed from cold storage. The specimen is covered with a 0.5 mm to 1 mm. fusion crust on four surfaces. On one of these surfaces the fusion crust has weathered to a brown color, while on the other surfaces the fusion crust is black. The S surface is a fracture surface that is 80% weathered and stained by iron-oxidation. The unweathered material is yellowish and appears homogeneous. Three fractures are present on the sample, two of these appear to be shallow. Sawing the specimen during processing revealed a light gray matrix material with oxidation halos around most of the visible metallic grains. Two interior cracks exist, but with no preferential weathering along them. Clasts as much as 3 mm. in diameter are present.

 

Petrographic Description: Brian Mason

Chondrules are sparse and ill-defined, their borders tending to merge with the granular groundmass, which consists mainly of olivine and pyroxene, with minor subequal amounts of nickel-iron and troilite, plagioclase, and accessory chromite. A moderate amount of limonitic staining is associated with the nickel-iron grains. Microprobe analyses give the following compositions: olivine, Fa25; pyroxene, Fs20; plagioclase, An10. The meteorite is an L6 chondrite. ALHA78114 is another L6 chondrite, similar to ALHA78112 in all respects.

Data from:
  MB76
  Table 2
  Line 336:
Origin or pseudonym:Main icefield
Mass (g):2485
Class:L6
Weathering grade:B
Fayalite (mol%):25
Ferrosilite (mol%):20
Comments:26Al=42±3; NTL=27.9±0.7
Catalogs:
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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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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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