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Allan Hills 84006
Basic information Name: Allan Hills 84006
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 84006
Observed fall: No
Year found: 1984
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 16 kg
Antarctic Meteorite Newsletter:  AMN 8(2)  (1985)  H4-5
AMN 9(4)  (1986)  H4,5
Meteoritical Bulletin:  MB 76  (1994)  H4-5
NHM Catalogue:  5th Edition  (2000)  H4-5
MetBase:  v. 7.1  (2006)  H4/5
Antarctic Meteorite Newsletter:  AMN 33(1)  (2010)  H4/5
Recommended:  H4/5    [explanation]

This is 1 of 496 approved meteorites classified as H4/5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeup from AMN 8(2):

Sample No.: ALH84006

Location: Allan Hills

Weight (g): 16000.0

Field No.: 2886

Dimensions (cm): 32 x 22 x 18

Meteorite Type: H4-5 Chondrite


Macroscopic Description: Carol Schwarz

Fusion crust with reddish oxidation haloes completely covers this meteorite. Large deep fractures occur throughout and white salt deposit is present in patches. The interior is mostly weathered with small areas of grayish matrix still present.


Thin Section (,3) Description: Glenn MacPherson

A pervasive iron-oxide staining indicates that this chondrite is moderately weathered. ALH84006 consists of highly fragmented and broken clasts, chondrules and crystals, none larger than approximately 1 mm in diameter. Chondrules are sharp, with well-preserved microcrystalline structure, but very few are round or unbroken. Olivine is mostly uniform in composition, Fa18, but a few grains as iron-rich as Fa23 were found. Pyroxene is commonly but not always monoclinic and is Fs17-18 in composition. Kamacite, troilite, and chromite are abundant, with minor taenite. Metal is much more abundant than the sulfide. Poorly crystalline and non-stoichiometric plagioclase was found, about An13-14, but no analyses free of iron or magnesium could be obtained. This meteorite differs from ALH84004 in having finer-grained metal and sulfide phases and lacking the shock veins of the latter. This is an H4/5 chondrite.

Data from:
  Table 2
  Line 972:
Origin or pseudonym:Near Western
Mass (g):16 kg
Weathering grade:B/Ce
Fayalite (mol%):18
Ferrosilite (mol%):17-18
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References: Published in Antarctic Meteorite Newsletter 8(2) (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° 45' 44"S, 158° 46' 28"E)
Note: the NHM and MetBase coordinates are 23.4 km apart

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