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Allan Hills A81010
Basic information Name: Allan Hills A81010
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA81010
This meteorite may also be called Allan Hills 81010 (ALH 81010) in publications.

Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 219 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 6(1)  (1983)  Eucrite-pmict
Meteoritical Bulletin:  MB 76  (1994)  Eucrite-pmict
NHM Catalogue:  5th Edition  (2000)  Eucrite-pmict
MetBase:  v. 7.1  (2006)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 342 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Writeuphelp
Writeup from AMN 6(1):

Sample No.: ALHA81010

Location: Allan Hills

Field No.: 1673

Weight (gms): 219.1

Meteorite Type: Polymict Eucrite

 

Physical Description: Roberta Score

Fusion crust totally covers ALHA81010. This achondrite is probably from the same fall as the other polymict eucrites found in Allan Hills area. Dimensions: 8 x 5 x 5.5 cm.

 

Petrographic Description: Brian Mason

The meteorite is a microbreccia consisting largely of angular monomineralic pyroxene and plagioclase clasts up to 4 mm in maximum dimension, and a few lithic clasts, in a matrix of comminuted pyroxene and plagioclase. Transparent brown fusion crust rims part of the section. The pyroxene is light to dark brown pigeonite; a few grains show exsolution lamellae. The lithic clasts have a maximum dimension of 3 mm, and consist of pigeonite and plagioclase with ophitic and gabbroic textures; one clast consists of angular pigeonite and plagioclase grains in a semi-opaque glassy matrix. Microprobe analyses show pigeonite and augite with a wide range of compositions: Wo5-36, En26-61, Fs31-57; plagioclase composition range is An78-93, mean An88. The meteorite is classified as a polymict eucrite, and is probably paired with ALHA81006, 81007, and 81008.

Data from:
  MB76
  Table 2
  Line 533:
Origin or pseudonym:Main icefield
Mass (g):219.1
Class:Eu "pm"
Weathering grade:A
Ferrosilite (mol%):31-57
Comments:76005 pairing group
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° 41' 20"S, 159° 22' 44"E)
Note: the NHM and MetBase coordinates are 8 km apart

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