Sample No.: ALHA79033

Location: Allan Hills

Field No.: 1170

Weight (gms): 208.8

Meteorite Type: L6 Chondrite

Physical Description: Roberta Score

All except one surface (which is a fracture surface) are covered with dull black to brown fusion crust. The fracture surface has weathered to a reddish-brown color, but several millimeter size inclusions are apparent on this surface. A 1 mm to 5 mm thick weathering rind is visible in the interior of this meteorite. The material exposed through chipping is light-gray in color with darker gray colored inclusions and mottled with reddish-brown oxidation. Metal is apparent but most of it has oxidation haloes around them. Dimensions: 7.5 x 6.5 x 3.5 cm.

Petrographic Description: Brian Mason

Chondrules are sparse and poorly defined, their margins merging with the granular groundmass, which consists largely of olivine and pyroxene with minor amounts of plagioclase, nickel-iron, and troilite. Fusion crust up to 0.6 mm thick is present along one edge. There is a moderate degree of weathering, shown by limonitic staining around nickel-iron grains. Microprobe analyses show olivine (Fa24), pyroxene (Fs20), and plagioclase (An10) of uniform composition. The meteorite is classified as an L6 chondrite.