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Allan Hills A81018
Basic information Name: Allan Hills A81018
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA81018
This meteorite may also be called Allan Hills 81018 (ALH 81018) in publications.

Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 2.24 kg
Antarctic Meteorite Newsletter:  AMN 6(1)  (1983)  L5
Meteoritical Bulletin:  MB 76  (1994)  L5
NHM Catalogue:  5th Edition  (2000)  L5
MetBase:  v. 7.1  (2006)  L5
Recommended:  L5    [explanation]

This is 1 of 8597 approved meteorites (plus 4 unapproved names) classified as L5.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeup from AMN 6(1):

Sample No.: ALHA81018

Location: Allan Hills

Field No.: 1421

Weight (gms): 2236.9

Meteorite Type: L5 Chondrite


Physical Description: Roberta Score

ALHA81018, an angular shaped stone, is entirely covered with dull black fusion crust. Several cracks penetrate the stone. The chip obtained for thin section has an approximately one centimeter thick continuous weathering rind. The center of the area exposed is light gray in color with several darker gray colored rounded inclusions. Dimensions: 13.5 x 11 x 10 cm.


Petrographic Description: Brian Mason

This section closely resembles that of ALHA81017, which suggests that these two specimens may be paired. Microprobe analyses give the following compositions: olivine, Fa24; orthopyroxene, Fs21; a little diopside Wo42Fs9, is present. The meteorite is classified as an L5 chondrite.

Data from:
  Table 2
  Line 541:
Origin or pseudonym:Middle Western
Mass (g):2236.9
Weathering grade:B
Fayalite (mol%):24
Ferrosilite (mol%):21
Comments:26Al=41±3; 81018 pairing group
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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° 49' 34"S, 158° 11' 39"E)
Note: the NHM and MetBase coordinates are 39.6 km apart

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