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Allan Hills A81031
Basic information Name: Allan Hills A81031
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA81031
This meteorite may also be called Allan Hills 81031 (ALH 81031) in publications.

Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 1595 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 6(1)  (1983)  LL3
AMN 7(1)  (1984)  L3
Meteoritical Bulletin:  MB 76  (1994)  L3.4
NHM Catalogue:  5th Edition  (2000)  L3.4
MetBase:  v. 7.1  (2006)  L3.4
Recommended:  L3.4    [explanation]

This is 1 of 51 approved meteorites classified as L3.4.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Writeuphelp
Writeup from AMN 6(1):

Sample No.: ALHA81031

Location: Allan Hills

Field No.: 1675

Weight (gms): 1594.9

Meteorite Type: LL3 Chondrite

 

Physical Description: Carol Schwarz

This angular specimen has only small patches of fusion crust remaining on its weathered surface. Many large fractures penetrate the stone. A piece fell off in handling to reveal a totally weathered interior. Dimensions: 13 x 9 x 9 cm.

 

Petrographic Description: Brian Mason

This specimen closely resembles ALHA81025 in texture, range of mineral compositions, and degree of weathering. It is therefore classified as an LL3 chondrite and tentatively paired with that meteorite.

Data from:
  MB76
  Table 2
  Line 554:
Origin or pseudonym:Main icefield
Mass (g):1594.9
Class:L3.4
Weathering grade:C
Fayalite (mol%):1-43
Ferrosilite (mol%):3-35
Comments:26Al=30±1; 77011 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° 42' 18"S, 159° 22' 46"E)
Note: the NHM and MetBase coordinates are 7.5 km apart

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