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Allan Hills A81093
Basic information Name: Allan Hills A81093
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA81093
This meteorite may also be called Allan Hills 81093 (ALH 81093) in publications.

Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 271 g
Antarctic Meteorite Newsletter:  AMN 6(1)  (1983)  H6
Meteoritical Bulletin:  MB 76  (1994)  H6
NHM Catalogue:  5th Edition  (2000)  H6
MetBase:  v. 7.1  (2006)  H6
Recommended:  H6    [explanation]

This is 1 of 6544 approved meteorites (plus 5 unapproved names) classified as H6.   [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.: ALHA81093

Location: Allan Hills

Field No.: 1488

Weight (gms): 271.0

Meteorite Type: H6 Chondrite


Physical Description: Roberta Score

Dull black fusion crust totally covers this meteorite. The interior has a discontinuous weathering rind with oxidation evenly distributed throughout. Small light and dark inclusions are visible in the gray-white matrix. Dimensions: 6 x 5.5 x 4 cm.


Petrographic Description: Brian Mason

Chondritic structure is barely perceptible, the few chondrules being extensively integrated with the granular groundmass, which consists largely of olivine and pyroxene, with minor amounts of nickel-iron, troilite, and plagioclase. Limonitic staining and small areas of limonite are present throughout the section. Microprobe analyses give the following compositions: olivine, Fa20; orthopyroxene, Fs17; plagioclase, An12. The meteorite is an H6 chondrite.

Data from:
  Table 2
  Line 616:
Origin or pseudonym:Main icefield
Mass (g):271
Weathering grade:A/B
Fayalite (mol%):20
Ferrosilite (mol%):17
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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'S, 159° 40'E)

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