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Allan Hills A81111
Basic information Name: Allan Hills A81111
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA81111
This meteorite may also be called Allan Hills 81111 (ALH 81111) in publications.

Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 210 g
Classification
  history:
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 5854 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)
Writeuphelp
Writeup from AMN 6(1):

Sample No.: ALHA81111

Location: Allan Hills

Field No.: 1431

Weight (gms): 210.3

Meteorite Type: H6 Chondrite

 

Physical Description: Roberta Score

The top half of ALHA81111 is covered with frothy black fusion crust while the remainder of the specimen is iridescent reddish-brown. Several cracks penetrate the interior. Chipping exposed only a small area of relatively unweathered material which is a very dark gray color. Dimensions: 8 x 4 x 6 cm.

 

Petrographic Description: Brian Mason

Chondrules are moderately abundant but their margins are diffuse, tending to merge with the granular groundmass, which consists of olivine and pyroxene with minor amounts of nickel-iron, troilite, and plagioclase. Limonitic staining and small areas of limonite are present, mainly in association with metal grains. Microprobe analyses give the following compositions: olivine, Fa19; orthopyroxene, Fs17; plagioclase, An13. The meteorite is an H6 chondrite.

Data from:
  MB76
  Table 2
  Line 634:
Origin or pseudonym:Middle Western
Mass (g):210.3
Class:H6
Weathering grade:B/C
Fayalite (mol%):19
Ferrosilite (mol%):17
Comments:26Al=38±2
Catalogs:
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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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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 49' 29"S, 158° 12' 41"E)
Note: the NHM and MetBase coordinates are 39.1 km apart

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