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Allan Hills 82131
Basic information Name: Allan Hills 82131
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 82131
Observed fall: No
Year found: 1982
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 1 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 7(2)  (1984)  C2
AMN 17(1)  (1994)  CM2
Meteoritical Bulletin:  MB 76  (1994)  CM2
NHM Catalogue:  5th Edition  (2000)  CM2
MetBase:  v. 7.1  (2006)  CM2
Recommended:  CM2    [explanation]

This is 1 of 533 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Writeuphelp
Writeup from AMN 7(2):

Sample No.: ALH82131

Location: Allan Hills

Field No.: 2913

Weight (gms): 1.0

Meteorite type: C2 chondrite

 

Physical Description: Roberta Score

One small patch of blistery fusion crust remains on this small meteorite fragment. The color of the exterior surfaces is black with a greenish tinge. The interior matrix is black and contains many submillimeter sized white inclusions.  A green colored weathering rind extends approximately 1 mm into the interior of the stone. Dimensions: 1 x 1 x 0.5 cm

 

Petrographic Description: Brian Mason

The very small section shows a single chondrule in black opaque matrix.  Microprobe analyses show that the matrix has the composition characteristic of C2 chondrites. Olivine in the chondrule is almost pure forsterite (FeO, 0.3%; CaO, 0.3-0.4%). The meteorite is a C2 chondrite.

Data from:
  MB76
  Table 2
  Line 870:
Origin or pseudonym:Far Western
Mass (g):1
Class:CM2
Weathering grade:A
Fayalite (mol%):0.3
Comments:81002 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 7(2) (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::   (76° 53' 1"S, 156° 55' 41"E)
Note: the NHM and MetBase coordinates are 72.3 km apart

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