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Allan Hills 83001
Basic information Name: Allan Hills 83001
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 83001
Observed fall: No
Year found: 1983
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 1569 g
Antarctic Meteorite Newsletter:  AMN 8(1)  (1985)  L4
Meteoritical Bulletin:  MB 76  (1994)  L4
NHM Catalogue:  5th Edition  (2000)  L4
MetBase:  v. 7.1  (2006)  L4
Recommended:  L4    [explanation]

This is 1 of 2000 approved meteorites (plus 4 unapproved names) classified as L4.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeup from AMN 8(1):

Sample No.: ALH83001

Location: Allan Hills

Weight (g): 1568.6

Field No.: 2559

Dimensions (cm): 17.5 x 9 x 6.5

Meteorite Type: L4 Chondrite


Macroscopic Description: Roberta Score

Shallow regmaglypts are present on exterior of this fusion crusted stone. Most of the interior that was exposed by chipping is weathered but may not be representative of the entire stone. The less weathered material is medium gray in color and contains chondrules.


Thin Section (,3) Description: Glenn MacPherson

Light to moderate limonitic staining indicates mild weathering. Chondrules up to 2.5 mm diameter are sharply defined. Brown glass is turbid and birefringent. Monoclinic pyroxene is abundant and has an observed composition range of Fs20 to Fs32. Olivine was found in the composition range Fa23 to Fa28. Metal (mostly one phase) and troilite are subequal in amount. This meteorite is probably an L4 chondrite.

Data from:
  Table 2
  Line 884:
Origin or pseudonym:Near Western
Mass (g):1568.6
Weathering grade:B
Fayalite (mol%):23-28
Ferrosilite (mol%):20-32
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References: Published in Antarctic Meteorite Newsletter 8(1) (1985), 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° 43' 16"S, 158° 44' 14"E)
Note: the NHM and MetBase coordinates are 23.8 km apart

     This is 1 of 43700 approved meteorites from Antarctica (plus 3802 unapproved names)
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