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Allan Hills 82103
Basic information Name: Allan Hills 82103
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 82103
Observed fall: No
Year found: 1982
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 2.53 kg
Antarctic Meteorite Newsletter:  AMN 7(1)  (1984)  H5
Meteoritical Bulletin:  MB 76  (1994)  H5
NHM Catalogue:  5th Edition  (2000)  H5
MetBase:  v. 7.1  (2006)  H5
Recommended:  H5    [explanation]

This is 1 of 10910 approved meteorites (plus 20 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeup from AMN 7(1):

Sample No.: ALH82103

Location: Allan Hills

Field No.: 2907

Weight (gms): 2529.2

Meteorite Type: H5 Chondrite


Physical Description: Carol Schwarz

A slightly weathered fusion crust covers nearly all of this meteorite. Regmaglypts occur on several faces. Surfaces not having fusion crust are weathered but a few small clasts are visible. The interior consists of gray matrix dotted with oxidation. A 1-2 mm thick weathering rind was exposed. Dimensions: 14 x 11 x 9 cm


Petrographic Description: Brian Mason

Chondrules are moderately abundant but may be poorly defined, tending to merge with the granular groundmass, which consists largely of olivine and pyroxene, with minor amounts of nickel-iron and troilite, and a little fine-grained plagioclase. Moderate weathering is indicated by brown limonitic staining around metal grains. Microprobe analyses give the following compositions: olivine, Fa17; pyroxene, Fs16. The meteorite is an H5 chondrite.

Data from:
  Table 2
  Line 842:
Origin or pseudonym:Far Western
Mass (g):2529.2
Weathering grade:B
Fayalite (mol%):17
Ferrosilite (mol%):16
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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::   (76° 53' 48"S, 156° 59' 29"E)
Note: the NHM and MetBase coordinates are 71.1 km apart

     This is 1 of 43500 approved meteorites from Antarctica (plus 3802 unapproved names)
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