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Allan Hills 84009
Basic information Name: Allan Hills 84009
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 84009
Observed fall: No
Year found: 1984
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 336 g
Antarctic Meteorite Newsletter:  AMN 9(2)  (1986)  Aubrite
Meteoritical Bulletin:  MB 76  (1994)  Aubrite
NHM Catalogue:  5th Edition  (2000)  Aubrite
MetBase:  v. 7.1  (2006)  Aubrite
Recommended:  Aubrite    [explanation]

This is 1 of 79 approved meteorites classified as Aubrite.   [show all]
Search for other: Achondrites, Aubrites, Enstatite achondrites, and Enstatite-rich meteorites
Writeup from AMN 9(2):

Sample No..: ALH84009, 010, 012, 013, 014, 015, 016, 017, 018, 019, 020, 021, 022, 024

Location: Allan Hills

Meteorite Type: Aubrite

See Table 4 for weights, dimensions, and field numbers.


Macroscopic Description: René Martinez

Most of these aubrites have thin patchy brown to yellow fusion crust. All specimens are slightly weathered. Enstatite clasts are as large as 3.5 cm and as small as 1 mm. The clast population ranges from sparse to dense for the different specimens. Dark aphanitic inclusions and metallic inclusions surrounded by oxidation haloes are both common.


Thin Section Description: Brian Mason

Polished thin sections of these specimens show that they are aubrites, and can confidently be paired with ALH84007, 008, and 011 (described in Antarctic Meteorite Newsletter 8(2), and probably with ALH83009 and 015, collected in the same area (Middle Western Icefield). They consist almost entirely of iron-free enstatite, with rare plagioclase (An7-10), forsterite (usually iron-free, but up to Fa9), and iron-free diopside (Wo42). Small amounts of opaque minerals are present; these include troilite, oldhamite, alabandite, daubreelite, and nickel-iron.


Visual inspection of chips of ALH84014, 015, 018, 019, 020, 021, and 022 show that these are also aubrites, probably pieces of the same meteorite.

Data from:
  Table 2
  Line 975:
Origin or pseudonym:Middle Western
Mass (g):335.6
Weathering grade:A
Fayalite (mol%):0
Ferrosilite (mol%):0
Comments:83009 pairing group
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References: Published in Antarctic Meteorite Newsletter 9(2) (1986), 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° 51' 56"S, 158° 31' 27"E)
Note: the NHM and MetBase coordinates are 33.6 km apart

     This is 1 of 43857 approved meteorites from Antarctica (plus 3802 unapproved names)
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