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Allan Hills 84011
Basic information Name: Allan Hills 84011
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 84011
Observed fall: No
Year found: 1984
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 138.2 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 8(2)  (1985)  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 63 approved meteorites classified as Aubrite.   [show all]
Search for other: Achondrites, Aubrites, Enstatite achondrites, and Enstatite-rich meteorites
Writeuphelp
Writeup from AMN 8(2):

Sample No.: ALH84011

Location: Allan Hills

Weight (g): 138.2

Field No.: 1459

Dimensions (cm): 7.5 x 5 x 4

Meteorite Type: Aubrite

 

Macroscopic Description: Carol Schwarz

This fragment is a complex breccia consisting of large white clasts; the largest is 2 cm in diameter. Other clasts range from 1 mm and greater. The "N" face shows a contact between dark glassy(?) matrix with white clasts and a white brecciated area of white clasts with small dark inclusions, sometimes rusty. There are also several dark inclusions up to 5 mm in diameter. A small amount of yellowish fusion crust(?) is present on one exterior surface. The thin section chip has both the light and dark areas.

 

Thin Section (,4) Description: Glenn MacPherson

This very coarse-grained aubrite shows only local effects of weathering in the vicinity of metal grains. Enstatite (FeO <0.1%) occurs as intensely strained crystals up to 5 mm in length that are set in a highly brecciated and granulated matrix. The matrix is composed of enstatite plus an assemblage of troilite, kamacite, schreibersite, daubreelite, and alabandite. Rare veins of presumably shock-produced brown, isotropic glass occur and exhibit a swirled texture with numerous tiny globules of sulfide(?).

Data from:
  MB76
  Table 2
  Line 977:
Origin or pseudonym:Middle Western
Mass (g):138.2
Class:Aub
Weathering grade:A
Fayalite (mol%):0
Ferrosilite (mol%):0
Comments:83009 pairing group
Catalogs:
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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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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 52' 43"S, 158° 37' 6"E)
Note: the NHM and MetBase coordinates are 32.3 km apart

Statistics:
     This is 1 of 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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