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Allan Hills 82101
Basic information Name: Allan Hills 82101
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 82101
Observed fall: No
Year found: 1982
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 29.1 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 6(2)  (1983)  CO3
Meteoritical Bulletin:  MB 76  (1994)  CO3
NHM Catalogue:  5th Edition  (2000)  CO3.3
MetBase:  v. 7.1  (2006)  CO3.4
Antarctic Meteorite Newsletter:  AMN 31(1)  (2008)  CO3.4
Recommended:  CO3.4    [explanation]

This is 1 of 5 approved meteorites classified as CO3.4.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Writeuphelp
Writeup from AMN 6(2):

Sample No.: ALHA82101

Location: Allan Hills

Field No.: 2908

Weight (gms): 29.1

Meteorite Type: C3O Carbonaceous Chondrite

 

Physical Description: Carol Schwarz

The exterior surfaces that are not covered with a shiny, blistery fusion crust are gray brown in color, contain small inclusions, and are rough on a millimeter scale. The interior is a gray beige color with a 1 mm discontinuous weathering rind. Some metal is present. The matrix is fine-grained. A few white and darker gray inclusions are present. Dimensions: 3 x 2.7 x 2.7 cm

 

Petrographic Description: Brian Mason

The section shows an aggregate of small chondrules (average diameter approx. 0.5 mm), chondrule fragments, and mineral grains set in a translucent yellow brown isotropic matrix. The chondrules show a wide variety of textures; in barred olivine chondrules the bars are pale brown isotropic glass. Minor amounts of nickel-iron and sulfide are present, as small grains within some chondrules and also concentrated around their margins. Microprobe analyses of olivine show a wide composition range: Fa1-50, mean Fa22; only a few grains of pyroxene were found, with compositions in the range Fs1-10. The meteorite is classified as a C3 chondrite of the Ornans subtype.

Data from:
  MB76
  Table 2
  Line 840:
Origin or pseudonym:Far Western
Mass (g):29.1
Class:CO3
Weathering grade:A
Fayalite (mol%):1-50
Ferrosilite (mol%):1-10
Comments:82101 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 6(2) (1983), 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° 53' 3"S, 156° 55' 51"E)
Note: the NHM and MetBase coordinates are 72.2 km apart

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