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Allan Hills 84005
Basic information Name: Allan Hills 84005
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 84005
Observed fall: No
Year found: 1984
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 12 kg
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 9(1)  (1986)  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 7172 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 9(1):

Sample No.: ALH84005

Location: Allan Hills

Weight (g): 12000 (approx.)

Field No.: 2061

Dimensions (cm): 30 x 18 x 15 Meteorite Type: L5 Chondrite

 

Macroscopic Description: Carol Schwarz

This chondrite is covered with smooth fusion crust which is polygonally fractured, dotted with oxidation haloes, and has a blistery texture in some areas. Areas devoid of fusion crust are grayish with oxidation scattered throughout. The interior is gray and shows minor oxidation.

 

Thin Section (,4) Description: Brian Mason

Chondrules and chondrule fragments are fairly abundant, 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. Minor weathering is indicated by rusty haloes around metal grains. Microprobe analyses give the following compositions: olivine, Fa21; pyroxene, Fs18. These compositions are intermediate between those characteristic of H and L groups; the amount of metal suggests L group, and the meteorite is tentatively classified as an L5 chondrite.

Data from:
  MB76
  Table 2
  Line 971:
Origin or pseudonym:Far Western
Mass (g):12 kg
Class:L5
Weathering grade:A/B
Fayalite (mol%):21
Ferrosilite (mol%):18
Comments:26Al=51±3
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 9(1) (1986), 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° 53' 28"S, 156° 53' 36"E)
Note: the NHM and MetBase coordinates are 73.3 km apart

Statistics:
     This is 1 of 40756 approved meteorites from Antarctica (plus 4494 unapproved names)
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