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Allan Hills A77292
Basic information Name: Allan Hills A77292
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77292
This meteorite may also be called Allan Hills 77292 (ALH 77292) in publications.

Observed fall: No
Year found: 1977 or 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 199.6 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 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 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.: ALHA77292

Location: Allan Hills

Field No.: 78010211A

Weight (gms): 199.6

Meteorite Type: L6 Chondrite

 

Physical Description:

This is not a complete specimen. The T surface is less severely weathered than any of the remaining surfaces. The N surface has remnants of dull black fusion crust. The surfaces devoid of fusion crust are stained reddish-brown by iron oxidation and are rough. On fractured surfaces it appears as if rounded and irregular inclusions are present in the sample. This sample appears macroscopically similar to ALHA77180, 218, 267, 292 and 301.

 

Petrographic Description: Brian Mason

Chondrules are sparse and poorly defined, their margins tending to merge with the granular groundmass, which consists of olivine and pyroxene, with minor amounts of plagioclase, nickel-iron and troilite. The nickel-iron grains show a small amount of limonitic alteration. Microprobe analyses show olivine (Fa24), orthopyroxene (Fs20), and plagioclase (An10) of uniform composition. The meteorite is classified as an L6 chondrite.

Data from:
  MB76
  Table 2
  Line 242:
Origin or pseudonym:Main icefield
Mass (g):199.6
Class:L6
Weathering grade:B
Fayalite (mol%):24
Ferrosilite (mol%):20
Comments:77001 pairing group
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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