Sample No.: ALHA81003

Location: Allan Hills

Field No.: 1228

Weight (gms): 10.1

Meteorite Type: C3V Carbonaceous Chondrite

Physical Description: Roberta Score

One small patch of fusion crust remains on this clastic carbonaceous chondrite. Abundant irregular shaped white inclusions dot the otherwise black surface. Few of the inclusions are oxidated. Metal was noted. Dimensions: 2.5 x 2.0 x 1.5 cm.

Petrographic Description: Brian Mason

The section shows numerous chondrules up to 3 mm across and irregular crystalline aggregates up to 2 mm in maximum dimension set in a minor amount of dark brown to black semi-opaque matrix. The chondrules and aggregates consist mainly of olivine with some polysynthetically twinned pyroxene. Trace amounts of nickel-iron are present as minute grains. Sulfide is present in minor amount, finely dispersed throughout the section. Microprobe analyses of chondrule's olivine show a wide composition range: Fa0-40, mean Fa8; the matrix consists largely of fine-grained iron-rich olivine, Fa40-60. Pyroxene in the chondrules is clinoenstatite, mostly near Fs1, but with occasional Fe-rich grains. The meteorite is classified as a C3V chondrite.