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Allan Hills 82104
Basic information Name: Allan Hills 82104
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 82104
Observed fall: No
Year found: 1982
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 399 g
Antarctic Meteorite Newsletter:  AMN 7(1)  (1984)  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 8604 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 7(1):

Sample No.: ALH82104

Location: Allan Hills

Field No.: 2993

Weight (gms): 398.8

Meteorite Type: L5 Chondrite


Physical Description: Roberta Score

ALH82104 is Mostly covered with thin black fusion crust. Areas not covered are brown in color and rough in texture. The stone's interior is made up of light gray matrix with rounded and irregular shaped inclusions. A few oxidation halos are present as is a continuous weathering rind. Dimensions: 6 x 6 x 6 cm


Petrographic Description: Brian Mason

Chondrules are moderately abundant, but some of them are poorly defined and tend to merge with the granular groundmass, which consists largely of olivine and pyroxene, with minor amounts of nickel-iron and troilite. Weathering is minor, being limited to brown limonitic staining around metal grains. Microprobe analyses give the following compositions: olivine, Fa25; pyroxene, Fs21. The meteorite is an L5 chondrite.

Data from:
  Table 2
  Line 843:
Origin or pseudonym:Far Western
Mass (g):398.8
Weathering grade:A
Fayalite (mol%):25
Ferrosilite (mol%):21
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References: Published in Antarctic Meteorite Newsletter 7(1) (1984), 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::   (77° 3' 3"S, 157° 11' 54"E)
Note: the NHM and MetBase coordinates are 72.8 km apart

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