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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
Classification
  history:
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 6534 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)
Writeuphelp
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:
  MB76
  Table 2
  Line 541:
Origin or pseudonym:Middle Western
Mass (g):2236.9
Class:L5
Weathering grade:B
Fayalite (mol%):24
Ferrosilite (mol%):21
Comments:26Al=41±3; 81018 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° 49' 34"S, 158° 11' 39"E)
Note: the NHM and MetBase coordinates are 39.6 km apart

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