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Allan Hills A81017
Basic information Name: Allan Hills A81017
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA81017
This meteorite may also be called Allan Hills 81017 (ALH 81017) in publications.

Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 1434 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 6(1)  (1983)  L5
AMN 13(1)  (1990)  L6
Meteoritical Bulletin:  MB 76  (1994)  L6
NHM Catalogue:  5th Edition  (2000)  L6
MetBase:  v. 7.1  (2006)  L5
Recommended:  L5    [explanation]

This is 1 of 6528 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.: ALHA81017

Location: Allan Hills

Field No.: 1494

Weight (gms): 1434.4

Meteorite Type: L5 Chondrite

 

Physical Description: Carol Schwarz,

This specimen consists of two pieces that cannot be fit together, but are obviously the same stone. Each piece has several small patches of dark fusion crust. The samples have a rough texture and are reddish-brown. The matrix is gray with small white and gray inclusions or chondrules. A gray weathering rind was exposed where chips were broken off. Oxidation haloes are also present. Dimensions: 13.5 x 8 x 7 cm and 10 x 9 x 5.5 cm.

 

Petrographic Description: Brian Mason

Chondrules are moderately abundant, ranging up to 1.8 mm across, but their margins tend to merge with the granular groundmass, which consists largely of olivine and pyroxene, with minor amounts of nickel-iron and troilite. Microprobe analyses give the following compositions: olivine, Fa25; orthopyroxene, Fs21; one grain of diopside, Wo41Fs8, was noted. The meteorite is classified as an L5 chondrite.

Data from:
  MB76
  Table 2
  Line 540:
Origin or pseudonym:Main icefield
Mass (g):1434.4
Class:L6
Weathering grade:B
Fayalite (mol%):25
Ferrosilite (mol%):21
Comments:26Al=54±2; 80101 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° 46' 25"S, 159° 16' 39"E)
Note: the NHM and MetBase coordinates are 11.8 km apart

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