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Allan Hills A81027
Basic information Name: Allan Hills A81027
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA81027
This meteorite may also be called Allan Hills 81027 (ALH 81027) in publications.

Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 3.84 kg
Antarctic Meteorite Newsletter:  AMN 6(1)  (1983)  L6
Meteoritical Bulletin:  MB 76  (1994)  L6
NHM Catalogue:  5th Edition  (2000)  L6
MetBase:  v. 7.1  (2006)  L6
Recommended:  L6    [explanation]

This is 1 of 12583 approved meteorites (plus 8 unapproved names) classified as L6.   [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.: ALHA81027

Location: Allan Hills

Field No.: 1556, 1557

Weight (gms): 3835.3

Meteorite Type: Shocked L6 Chondrite

Physical Description: Roberta Score

ALHA81027 consists of two pieces that fit together perfectly but do not form a complete specimen. Patchy fusion crust covers most of the meteorite. The broken surfaces are smooth and reddish-brown. The interior of the smaller of the two pieces is totally weathered. Dimensions: 17 x 11.5 x 10 cm

Petrographic Description: Brian Mason

Chondrules are barely discernable, merging with the granular groundmass, which consists largely of olivine and pyroxene, with minor amounts of maskelynite, nickel-iron, and troilite. Remnants of fusion crust rim part of the section. Minor weathering is indicated by brown limonitic staining around metal grains. Microprobe analyses give the following compositions: olivine, Fa25 orthopyroxene, Fs21; maskelynite has CaO content equivalent to An10 but Na2O is low and variable, 4.0-5.2%. The meteorite is a shocked L6 chondrite.

Data from:
  Table 2
  Line 550:
Origin or pseudonym:Main icefield
Mass (g):3835.3
Weathering grade:C
Fayalite (mol%):25
Ferrosilite (mol%):21
Comments:26Al=45±3; 81027 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° 41' 24"S, 159° 15' 47"E)
Note: the NHM and MetBase coordinates are 10.8 km apart

     This is 1 of 44248 approved meteorites from Antarctica (plus 3802 unapproved names)
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