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Allan Hills A77252
Basic information Name: Allan Hills A77252
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77252
This meteorite may also be called Allan Hills 77252 (ALH 77252) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 343 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 2(1)  (1979)  L4
AMN 3(2)  (1980)  L4 w/L6 clasts
AMN 4(1)  (1981)  L3 w/L6 clasts
AMN 7(1)  (1984)  L3
Meteoritical Bulletin:  MB 76  (1994)  L3
NHM Catalogue:  5th Edition  (2000)  L3
MetBase:  v. 7.1  (2006)  L3-6
Antarctic Meteorite Newsletter:  AMN 33(1)  (2010)  L3-6
Recommended:  L3-6    [explanation]

This is 1 of 51 approved meteorites classified as L3-6.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
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.: ALHA77252

Location: Allan Hills

Field No.: 77122944

Weight (gms): 343.1

Meteorite Type: L3 Chondrite with L6 clasts

 

Physical Description:

This sample suffered considerable damage during transport from the Antarctic and was noted as consisting of chips and fines on its arrival in California. One piece has dull, black, fusion crust present. The matrix of all pieces is greenish-gray and contains many inclusions, ranging to more than 1 cm in diameter. Many surfaces have an orangish-brown weathering rind.

 

Petrographic Description: Brian Mason

The chip from which the thin section was made showed a marked division into two parts, the larger dark gray and chondrite, the smaller pale gray and granular. The granular part appears to contain some poorly defined chondrules; in the chondritic part chondrules are numerous and well-defined, sometimes broken and fragmentary. Minor subequal amounts of nickel-iron and troilite are present in both parts. A small amount of limonitic staining is present, concentrated around the metal grains. Microprobe analyses show olivine and pyroxene in the two parts to have essentially identical and uniform compositions: olivine, Fa23, pyroxene, Fs20. Minor plagioclase (An12) was detected in both parts. This meteorite is an L-group chondrite, the chondrite part may be classified L3, the granular part L6.

Data from:
  MB76
  Table 2
  Line 203:
Origin or pseudonym:Main icefield
Mass (g):343.1
Class:L3
Weathering grade:B
Fayalite (mol%):22-28
Ferrosilite (mol%):2-22
Comments:26Al=42±2; 77216 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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