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(?).