Sample No.: ALH85003

Location: Allan Hills

Weight (g): 50.1

Field No.: 2259

Dimensions (cm): 4x3.5x2.5

Meteorite Type: C3O Chondrite

Macroscopic Description: René Martinez

Thick patchy fusion crust covers approximately 70% of this carbonaceous chondrite. The interior is light gray and chondrules/clasts are not distinguishable in the granular matrix. A 1 mm thick weathering rind and small patches of rust are present.

Thin Section (,4) Description: Brian Mason

The thin section shows an aggregate of small chondrules (up to 0.9 mm diameter, but most are less than 0.6 mm), chondrule fragments, and irregular aggregates set in a translucent yellow-brown matrix. Chondrules are mainly granular or porphyritic olivine. Minor amounts of nickel-iron and sulfide are present, as small grains scattered throughout the section. Microprobe analyses of olivine show a wide composition range, Fa1-56, mean Fa17; only a few grains of pyroxene were found, having a composition range of Fs0.5-23. The meteorite is classified as a C3 chondrite of the Ornans subtype; it is so similar to ALH82101 that the possibility of pairing should be considered.