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Allan Hills A81041
Basic information Name: Allan Hills A81041
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA81041
This meteorite may also be called Allan Hills 81041 (ALH 81041) in publications.

Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 729 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 6(2)  (1983)  H4
Meteoritical Bulletin:  MB 76  (1994)  H4
NHM Catalogue:  5th Edition  (2000)  H4
MetBase:  v. 7.1  (2006)  H4
Recommended:  H4    [explanation]

This is 1 of 5782 approved meteorites (plus 2 unapproved names) classified as H4.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeuphelp
Writeup from AMN 6(2):

Sample Nos: ALHA81041, 81044, 81045, 81046, 81047, 81048, 81049, 81050, 81051, 81052

Location: Allan Hills

Field Nos.: 1146, 1125, 1141, 1100, 1121, 1648, 1147, 1143, 1106

Combined Weight: 1600.9

Meteorite Type: H4 Chondrite

 

Physical. Description: Roberta Score

These ten samples represent 31 specimens which may be paired. Small bits of fusion crust are present on a couple of the stones. Most are extensive weathered inside and out.

 

Petrographic Description: Brian Mason

Chondrules are abundant, and are set in a granular groundmass of olivine and pyroxene, with minor amounts of nickel-iron and troilite. Some of the pyroxene is polysynthetically twinned clinobronzite. Brown limonitic staining pervades the section. Microprobe analyses gave the following compositions: olivine, Fa18; pyroxene somewhat variable, Fs15-23, mean Fs18. The meteorite is classified as an H4 chondrite.

 

The sections of ALHA81043, 81044, 81045, 81046, 81047, 81048, 81049, 81050, 81051, and 81052 are very similar to that of ALHA81041, which suggests that some or all of these meteorites may be paired.

Data from:
  MB76
  Table 2
  Line 564:
Origin or pseudonym:Near Western
Mass (g):728.8
Class:H4
Weathering grade:C
Fayalite (mol%):18
Ferrosilite (mol%):15-23
Comments:26Al=52±2; 81041 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 6(2) (1983), 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' 19"S, 158° 45' 42"E)
Note: the NHM and MetBase coordinates are 23.2 km apart

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