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.