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Allan Hills 82105
Basic information Name: Allan Hills 82105
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 82105
Observed fall: No
Year found: 1982
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 363 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 7(1)  (1984)  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 7(1):

Sample No.: ALH82105

Location: Allan Hills

Field No.: 2996

Weight (gms): 363.3

Meteorite Type: L6 Chondrite

 

Physical Description: Roberta Score

ALH82105 is flat with well rounded edges and is totally covered with brown and black polygonally fractured fusion crust. Many oxidation halos are visible on the fusion crust. A continuous weathering rind with thickness ranging from 0.1 to 0.5 cm was exposed when the meteorite was chipped. The center of the stone is whitish-gray in color with few areas of oxidation present. Abundant metal is obvious. Dimensions: 8 x 7.5 x 3 cm

 

Petrographic Description: Brian Mason

Chondrules are relatively sparse, most of the section consisting of a granular aggregate of olivine and pyroxene, with minor amounts of plagioclase, nickel-iron, and troilite. Well-preserved fusion crust, up to 0.6 mm thick, rims part of the sections. Minor weathering is indicated by brown limonitic staining around metal grains. Microprobe analyses give the following compositions: olivine, Fa24; pyroxene, Fs21; plagioclase, An11. The meteorite is an L6 chondrite.

Data from:
  MB76
  Table 2
  Line 844:
Origin or pseudonym:Far Western
Mass (g):363.3
Class:L6
Weathering grade:A/B
Fayalite (mol%):24
Ferrosilite (mol%):21
Comments:26Al=45±2
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 7(1) (1984), 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::   (77° 2' 55"S, 157° 11' 0"E)
Note: the NHM and MetBase coordinates are 73 km apart

Statistics:
     This is 1 of 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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