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Allan Hills A77297
Basic information Name: Allan Hills A77297
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77297
This meteorite may also be called Allan Hills 77297 (ALH 77297) in publications.

Observed fall: No
Year found: 1977 or 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 952 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 2(1)  (1979)  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 10989 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 2(1):
This text was reprinted from AMN 2(1) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: ALHA77297

Location: Allan Hills

Field No.: 78010210C

Weight (gms): 951.6

Meteorite Type: L6 Chondrite

 

Physical Description:

The overall shape of the specimen is oblong (12.0x7.5x6.0 cm). Shiny black, polygonally fractured fusion crust (~0.5 to l mm thick) is present on the B surface. On the B surface an area ~2 mm in diameter, possibly a partially melted chondrule, is shinier than the surrounding fusion crust. The N surface appears to be a recently fractured surface that is whitish gray with small, <1 mm inclusions. Orangish brown oxidation staining is present on all surfaces. Cleaving the meteorite in half, revealed metallic flecks, <0.5 mm in maximum diameter, that make up approximately 5% of the sample. Some haloing effects are apparent.

 

Petrographic Description: Brian Mason

Chondrules are sparse and poorly developed, tending to merge with the granular groundmass, which consists largely of olivine and orthopyroxene, with minor sub-equal amounts of nickel-iron and troilite, and a little untwinned plagioclase. A little limonitic staining is present around some of the nickel-iron grains. Microprobe analyses show olivine (Fa24), orthopyroxene (Fs20), and plagioclase (An11) of uniform composition. The meteorite is classified as an L6 chondrite.

Data from:
  MB76
  Table 2
  Line 247:
Origin or pseudonym:Main icefield
Mass (g):951.6
Class:L6
Weathering grade:A
Fayalite (mol%):24
Ferrosilite (mol%):20
Comments:26Al=70±7; NTL=2.5±0.2; 77001 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 2(1) (1979), 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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