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Allan Hills 84029
Basic information Name: Allan Hills 84029
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 84029
Observed fall: No
Year found: 1984
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 119.8 g
Antarctic Meteorite Newsletter:  AMN 8(2)  (1985)  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 8(2):

Sample No.: ALH84029

Location: Allan Hills

Weight (g): 119.8

Field No.: 1534

Dimensions (cm): 5.5 x 5 x 4

Meteorite Type: C2 Chondrite


Macroscopic Description: Carol Schwarz

This specimen is black and angular with smooth sides. Many fractures are present as well as some white salt deposit. The interior is black and fine-grained. The sample is similar to ALH83100.


Thin Section (,3) Description: Glenn MacPherson

This meteorite resembles ALH84030, ALH84031, ALH84032, ALH84034, ALH84042, and ALH84044. All are very similar to one another and all resemble ALH83100, with which they are probably paired. Alteration is extensive and the major component is a brown to black phyllosilicate matrix that encloses green to pale brown phyllosilicate pseudomorphs of chondrules, crystals and inclusions. Calcite is abundant. Sporadic primary olivine crystals are preserved and are mostly Fa0-2, although a few as iron-rich as Fa37 were found. Chromite, pentlandite, and (?) magnetite are accessory. Chondrules and inclusions range up to a little over 1 mm in diameter. Inclusions are completely altered. This is a C2 chondrite.

Data from:
  Table 2
  Line 994:
Origin or pseudonym:Far Western
Mass (g):119.8
Weathering grade:Ae
Fayalite (mol%):0-2
Comments:26Al=12±1; 83100 pairing group
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References: Published in Antarctic Meteorite Newsletter 8(2) (1985), 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::   (77° 2' 33"S, 157° 4' 24"E)
Note: the NHM and MetBase coordinates are 75.1 km apart

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