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Allan Hills 83042
Basic information Name: Allan Hills 83042
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 83042
Observed fall: No
Year found: 1983
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 0.5 g
Antarctic Meteorite Newsletter:  AMN 10(2)  (1987)  H3
Meteoritical Bulletin:  MB 76  (1994)  H3.6
NHM Catalogue:  5th Edition  (2000)  H3.6
MetBase:  v. 7.1  (2006)  H3.6
Recommended:  H3.6    [explanation]

This is 1 of 43 approved meteorites classified as H3.6.   [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Writeup from AMN 10(2):

Sample No.: ALH83042

Location: Allan Hills

Weight (g): 0.5

Field No.: 2125

Dimensions (cm): 1 x 0.5 x 0.5

Meteorite Type: H3 Chondrite


Macroscopic Description: René Martinez

This tiny specimen consists mainly of fusion crust and a small amount of moderately weathered chondritic material.


Thin Section (,2) Description: Brian Mason

The small section shows numerous chondrules, up to 0.7 mm across, in a finely granular groundmass which contains a moderate amount of nickel-iron and troilite. The chondrules consist mainly of granular olivine and olivine-pyroxene, with some of fine-grained radiating pyroxene. The section is stained yellow-brown with limonitic material, with small areas of red-brown limonite along one edge. Microprobe analyses show olivine ranging in composition from Fa7 to Fa33, with a mean of Fa20 (CV FeO is 31); pyroxene composition ranges from Fs2 to Fs15. The composition of the olivine and pyroxene and the amount of nickel-iron indicate H group, and the range of olivine composition type 3, hence the meteorite is classified as an H3 chondrite (estimated H3.6).

Data from:
  Table 2
  Line 925:
Origin or pseudonym:Middle Western
Mass (g):0.5
Weathering grade:B
Fayalite (mol%):7-33
Ferrosilite (mol%):2-16
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References: Published in Antarctic Meteorite Newsletter 10(2) (1987), 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° 49' 4"S, 158° 11' 24"E)
Note: the NHM and MetBase coordinates are 39.4 km apart

     This is 1 of 43331 approved meteorites from Antarctica (plus 3802 unapproved names)
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