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Allan Hills 83015
Basic information Name: Allan Hills 83015
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 83015
Observed fall: No
Year found: 1983
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 3.1 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 8(1)  (1985)  Aubrite (?)
AMN 13(1)  (1990)  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(1):

Sample No.: ALH83015

Location: Allan Hills

Weight (g): 3.1

Field No.: 2138

Dimensions (cm): 1.5 x 1.5 x 1

Meteorite Type: Aubrite (?)

 

Macroscopic Description: Roberta Score

This specimen is white in color and is identical in appearance to ALH83009.

 

Thin Section (,2) Description: Jeremy Delaney

ALH83015 is a pyroxenite breccia with clasts up to 1-5 mm. Matrix is very fine-grained with brown/green staining common. Pyroxene grains often contain submicron to 10 micron opaque (troilite?) inclusions on healed cracks. One heavily clouded pyroxene is also present. Areas of fine-grained breccia against coarse-grained breccia occur. Tiny olivine-troilite clasts are present, as are small matrix olivines. Large orthopyroxene clasts have mottled appearance and appear shocked. The pyroxene has no micron or larger scale exsolution and appears to be orthopyroxene. Brown staining caused by weathering of metal/troilite stains most grain boundaries and large troilite or metal clasts often have "rusty" halos. This specimen may be similar to the 83009 aubrite. Minor phases include daubreelite, alabandite, metal and Ti-bearing troilite.

Data from:
  MB76
  Table 2
  Line 898:
Origin or pseudonym:Middle Western
Mass (g):3.1
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' 20"S, 158° 12' 47"E)
Note: the NHM and MetBase coordinates are 39 km apart

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