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Allan Hills 83106
Basic information Name: Allan Hills 83106
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 83106
Observed fall: No
Year found: 1983
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 22.3 g
Antarctic Meteorite Newsletter:  AMN 9(1)  (1986)  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 615 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Writeup from AMN 9(1):

Sample No.: ALH83106

Location: Allan Hills

Weight (g): 22.3

Field No.: 2799

Dimensions (cm): 4.5 x 2.5 x 1.5

Meteorite Type: C2 Chondrite


Macroscopic Description: Carol Schwarz,

This meteorite has a rectangular shape and is covered with a very black and sometimes polygonally fractured fusion crust on three sides. The other surfaces are olive green and very fine-grained. One or two cracks penetrate the specimen. The interior is black and very fine-grained.


Thin Section (,4) Description: Brian Mason

Chondrules are small and sparse, the section consisting largely of small mineral grains (0.01-0.1 mm across) in a translucent brown to black matrix. Most of the mineral grains are serpentinized. Olivine in the chondrules is mostly close to forsterite in composition, but compositions up to Fa5 were measured. Troilite and nickel-iron are extremely rare. The meteorite is a C2 chondrite, possibly paired with ALH83100.

Data from:
  Table 2
  Line 964:
Origin or pseudonym:Far Western
Mass (g):22.3
Weathering grade:A
Fayalite (mol%):0.2-5
Comments:83100 pairing group
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References: Published in Antarctic Meteorite Newsletter 9(1) (1986), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 57' 50"S, 156° 54' 27"E)
Note: the NHM and MetBase coordinates are 75.4 km apart

     This is 1 of 43700 approved meteorites from Antarctica (plus 3802 unapproved names)
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