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Allan Hills 83009
Basic information Name: Allan Hills 83009
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 83009
Observed fall: No
Year found: 1983
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 1.7 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 8(1)  (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 66 approved meteorites classified as Aubrite.   [show all]
Search for other: Achondrites, Aubrites, Enstatite achondrites, and Enstatite-rich meteorites
Writeuphelp
Writeup from AMN 8(1):

Sample No.: ALH83009

Location: Allan Hills

Weight (g): 1.7

Field No.: 2100

Dimensions (cm): 1.5 x 1.0 x 0.5

Meteorite Type: Aubrite

 

Macroscopic Description: Roberta Score

This specimen is white in color and is identical to ALH83015.

 

Thin Section (,1) Description: Jeremy Delaney

This is a coarse-grained, brecciated aubrite with several unbrecciated lithic fragments preserved. Orthopyroxene grains have interfingering texture. One grain with inclined extinction appears to be clinoenstatite. Generally no exsolution was observed. One small calcic pyroxene was observed in a 1 mm + orthopyroxene grain containing needle-like inclusions. Some orthopyroxene grains contain rounded melt pockets with extremely fine-grained needle-like crystallites of unidentified silicates. Orthopyroxene is En99.6Wo0.34 and feldspar is Ab90Or3.2. Other phases include daubreelite, alabandite, Fe-Ni metal and Ti-bearing troilite.

Data from:
  MB76
  Table 2
  Line 892:
Origin or pseudonym:Middle Western
Mass (g):1.7
Class:Aub
Weathering grade:A/B
Fayalite (mol%):0
Ferrosilite (mol%):0
Comments:83009 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 8(1) (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° 49' 19"S, 158° 12' 24"E)
Note: the NHM and MetBase coordinates are 39.1 km apart

Statistics:
     This is 1 of 38937 approved meteorites from Antarctica (plus 5051 unapproved names)
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