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Allan Hills 83100
Basic information Name: Allan Hills 83100
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 83100
Observed fall: No
Year found: 1983
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 3.02 kg
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 7(1)  (1984)  C2
AMN 17(1)  (1994)  CM2
Meteoritical Bulletin:  MB 76  (1994)  CM2
NHM Catalogue:  5th Edition  (2000)  CM2
MetBase:  v. 7.1  (2006)  CM1/2
Antarctic Meteorite Newsletter:  AMN 31(1)  (2008)  CM1/2
Recommended:  CM1/2    [explanation]

This is 1 of 25 approved meteorites classified as CM1/2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 1), CM chondrites, and CM-CO clan chondrites
Writeuphelp
Writeup from AMN 7(1):

Sample No.: ALH83100,1

Location: Allan Hills

Field No.: 2126

Weight (gms): 434.6

Meteorite Type: C2 Chondrite

Physical Description: Carol Schwarz

This is one fragment of a multi-fragment sample from the 1983 season. It is angular, rectangular-shaped, and extremely fractured, with several pieces falling off in handling. The surface is a dull black and fusion crust cannot be distinguished. Salt deposit has formed in some areas. A few (1 or 2) inclusions are barely discernible on the surface. The interior is dark and featureless. Dimensions: 8 x 7 x 6 cm

 

Petrographic Description: Brian Mason

The section shows a large number of clasts (up to 1 mm across) and mineral rains, and a few chondrules, in a minor amount of dark matrix. A little (about 1%) sulfide is present as minute grains, in part concentrated at the margins of chondrules. Nickel-iron occurs in trace amounts, some as small spherules. The clasts and most of the mineral grains consist of a serpentine-like mineral, probably an alteration of olivine. Microprobe analyses show there are a few grains of forsteritic olivine, and calicite grains were also identified. The meteorite is a C2 chondrite.

Data from:
  MB76
  Table 2
  Line 958:
Origin or pseudonym:Far Western
Mass (g):3019
Class:CM2
Weathering grade:Be
Fayalite (mol%):0-2
Ferrosilite (mol%):-
Comments:26Al=12±1; 83100 pairing group
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::   (76° 43'S, 159° 40'E)

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