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Allan Hills A81040
Basic information Name: Allan Hills A81040
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA81040
This meteorite may also be called Allan Hills 81040 (ALH 81040) in publications.

Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 194.5 g
Antarctic Meteorite Newsletter:  AMN 6(1)  (1983)  L4
Meteoritical Bulletin:  MB 76  (1994)  L4
NHM Catalogue:  5th Edition  (2000)  L4
MetBase:  v. 7.1  (2006)  L4
Recommended:  L4    [explanation]

This is 1 of 2012 approved meteorites (plus 4 unapproved names) classified as L4.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeup from AMN 6(1):

Sample No.: ALHA81040

Location: Allan Hills

Field No.: 1571

Weight (gms): 194.5

Meteorite Type: L4 Chondrite


Physical Description: Roberta Score

Dull black fusion crust covers approximately 3/4 of this rounded stone. Areas with no fusion crust have weathered to a deep reddish-brown. A small interior area of mostly weathered material with very dark matrix and some metal flecks was revealed by chipping. Dimensions: 5.5 x 5 x 5 cm.


Petrographic Description: Brian Mason

The section shows numerous well-defined chondrules in a granular groundmass consisting largely of olivine and pyroxene with minor amounts of nickel-iron and troilite. Chondrule types include porphyritic olivine and olivine-pyroxene, and fine-grained radiating pyroxenes. Much of the pyroxene is polysynthetically twinned clinobronzite. Brown limonitic staining is extensive throughout the section. Microprobe analyses give the following compositions: olivine, Fa25; pyroxene, Fs21. The meteorite is classified as an L4 chondrite.

Data from:
  Table 2
  Line 563:
Origin or pseudonym:Main icefield
Mass (g):194.5
Weathering grade:B/C
Fayalite (mol%):25
Ferrosilite (mol%):21
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References: Published in Antarctic Meteorite Newsletter 6(1) (1983), 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° 41' 4"S, 159° 15' 40"E)
Note: the NHM and MetBase coordinates are 11 km apart

     This is 1 of 43856 approved meteorites from Antarctica (plus 3802 unapproved names)
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