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Allan Hills A81033
Basic information Name: Allan Hills A81033
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA81033
This meteorite may also be called Allan Hills 81033 (ALH 81033) in publications.

Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 252 g
Antarctic Meteorite Newsletter:  AMN 6(1)  (1983)  H5
Meteoritical Bulletin:  MB 76  (1994)  H5
NHM Catalogue:  5th Edition  (2000)  H5
MetBase:  v. 7.1  (2006)  H5
Recommended:  H5    [explanation]

This is 1 of 10899 approved meteorites (plus 19 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeup from AMN 6(1):

Sample No.: ALHA81033

Location: Allan Hills

Field No.: 1318

Weight (gms): 252.4

Meteorite Type: H5 Chondrite

Physical Description: Carol Schwarz

This sample consists of six similar fragments. They have only small areas of remnant fusion crust and are mostly weathered. One of the smaller pieces was selected for thin section. Dimensions: 7 x 4.5 x 3 cm (largest piece)


Petrographic Description: Brian Mason

Chondritic structure is well developed, but the chondrules tend to merge with the granular groundmass, which consists largely of olivine and pyroxene with minor amounts of nickel-iron and troilite. Weathering is extensive, with brown limonitic staining and small areas of limonite throughout the section. Microprobe analyses give the following compositions: olivine, Fa18; orthopyroxene, Fs16. The meteorite is classified as an H5 chondrite.

Data from:
  Table 2
  Line 556:
Origin or pseudonym:Near Western
Mass (g):252.4
Weathering grade:C
Fayalite (mol%):18
Ferrosilite (mol%):16
Search for specimens in the Smithsonian Institution collection (U.S.):   
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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° 43' 19"S, 158° 45' 29"E)
Note: the NHM and MetBase coordinates are 23.3 km apart

     This is 1 of 43352 approved meteorites from Antarctica (plus 3802 unapproved names)
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