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Allan Hills A77011
Basic information Name: Allan Hills A77011
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77011
This meteorite may also be called Allan Hills 77011 (ALH 77011) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 292 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 3(1)  (1980)  LL3
AMN 7(1)  (1984)  L3
Meteoritical Bulletin:  MB 76  (1994)  L3.5
NHM Catalogue:  5th Edition  (2000)  L3.5
NIPR Catalogue:  2000 Edition  (2000)  L3
MetBase:  v. 7.1  (2006)  L3.5
Recommended:  L3.5    [explanation]

This is 1 of 95 approved meteorites classified as L3.5.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
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.: ALHA77011

Location: Allan Hills

Field No.: 77122937

Weight (gms) 291.5

Meteorite Type: LL-3 Chondrite

 

Physical Description:

The major portion of the sample is covered with fusion crust. Inclusions are apparent through the thin fusion crust on the B surface. The fusion crust on the T surface is shiny blackish-red and appears to be more severely weathered than the other surfaces. Regmaglypts are present on the E surface. In areas where the fusion crust has been removed, probably by physical processes, many inclusions are apparent in the interior of the stone.

 

Petrographic Description: Brian Mason

Chondrules are numerous and well developed, 0.2-1.2 mm in diameter, and are close-packed with only a small amount of groundmass. Some of the chondrules have prominent dark rims. The commonest types are granular olivine and prismatic or fine-grained pyroxene. Most of the pyroxene is polysynthetically twinned clinobronzite. Nickel-iron and troilite are present in unusually small amounts; troilite is concentrated in chondrule rims. A moderate amount of limonitic staining is present. Microprobe analyses show that olivine and pyroxene vary in composition; olivine ranges from Fa4 to Fa36, with a mean of Fa16 and the pyroxene ranges from Fs1 to Fs33, with a mean of Fs12. The low content of nickel-iron and troilite suggests LL group, and the meteorite is tentatively classified as an LL3 chondrite; however, definite assignment should await further investigation.

Data from:
  MB76
  Table 2
  Line 19:
Origin or pseudonym:Main icefield
Mass (g):291.5
Class:L3.5
Weathering grade:C
Fayalite (mol%):4-36
Ferrosilite (mol%):1-33
Comments:26Al=39±4; 77011 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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