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Allan Hills 84033
Basic information Name: Allan Hills 84033
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 84033
Observed fall: No
Year found: 1984
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 60.4 g
Classification
  history:
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 529 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 8(2):

Sample No.: ALH84033

Location: Allan Hills

Weight (g): 60.4

Field No.: 2810

Dimensions (cm): 5 x 4 x 2 (largest)

Meteorite Type: C2 Chondrite

 

Macroscopic Description: Carol Schwarz

This specimen consists of one large rounded piece with several small areas of fusion crust; two smaller pieces, and many <1 cm chips. The matrix is black with some lighter colored 1 mm sized chondrules/clasts and numerous small clasts. Some salt deposit has formed.

 

Thin Section (,5) Description: Glenn MacPherson

Unlike ALH83100 and its many paired kin, this specimen is a pristine example of a C2 carbonaceous chondrite that contains abundant preserved primary phases. Chondrules up to nearly 2 mm in diameter, abundant and varied inclusion types, crystals, and crystal fragments are dispersed in a black matrix that is reddish brown on thin edges. Olivine is uniformly Fa0-1 among the grains analyzed. Two pyroxene grains were encountered that have an average composition of Wo2En96Fs2. Troilite, pentlandite, Ni-Fe metal, chromite, and magnetite(?) are accessory phases. Many refractory inclusions are present, containing spinel, perovskite and, in a few cases, blue-pleochroic hibonite. Some of the inclusions are unusually large for a C2 meteorite, up to 0.6 mm. This meteorite shows little or no evidence of terrestrial weathering.

Data from:
  MB76
  Table 2
  Line 998:
Origin or pseudonym:Near Western
Mass (g):60.4
Class:CM2
Weathering grade:Ae
Fayalite (mol%):0-1
Ferrosilite (mol%):2
Comments:26Al=52±3; 81002 pairing group
Catalogs:
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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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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 44' 38"S, 158° 50' 20"E)
Note: the NHM and MetBase coordinates are 21.4 km apart

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