Sample No.: ALH84136

Location: Allan Hills

Weight (g): 83.5

Field No.: 1527

Dimensions (cm): 6.5 x 3 x 3.5

Meteorite Type: Ureilite

Macroscopic Description: René Martinez

Flaky black fusion crust entirely covers this specimen. The interior is dark gray and granular with crystals as large as 2 mm in a red-brown matrix. Stone is very coherent.

Thin Section (,3) Description: Brian Mason

The section shows an aggregate of anhedral to subhedral grains (0.6-2.4 mm across) of olivine and pyroxene, with about 10% of opaque material, in part disseminated throughout and in part concentrated along grain boundaries. Olivine grains are gray from submicroscopic opaque inclusions, whereas pyroxene grains are clear but are extremely fractured. Well-preserved fusion crust is present on one edge. Microprobe analyses give the following compositions: olivine, somewhat variable, Fa0-5, mean Fa3; pyroxene, essentially uniform, Wo5Fs4; one grain of endiopside, Wo34Fs2.5, was analysed. The mineralogy and texture are typical of a ureilite; this specimen is so similar in all respects to ALH82106 and 82130 that it can be confidently paired with them.