Sample No.: ALHA78106

Location: Allan Hills

Field No.: 400

Weight (gms): 464.5

Meteorite Type: L6 Chondrite

Physical Description:

Ice was noted on the sample when removed from the freezer. This semi-pyramidal shaped specimen appears to be unweathered. It is completely covered with a spotted brown, black, polygonally fractured, ~1 mm thick fusion crust. Shallow regmaglypts are present on all surfaces. A small portion ~2 cm. x 1 cm., of fusion crust was broken off the W surface, revealing a nonweathered, light gray matrix with dark and light clasts, as much as 1 mm in diameter. When the meteorite was cleaved in half during processing, abundant unoxidized metal was observed. Light and dark clasts, as much as 2 mm. in diameter, were present in the light gray matrix.

Petrographic Description: Brian Mason

Chondrules are sparse an• poorly defined, tending to merge with the granular groundmass, which consists of olivine and pyroxene with minor subequal amounts of nickel-iron and troilite, plagioclase, and accessory chromite. Well-developed fusion crust, 0.6 mm thick, rims one edge of the section. The meteorite appears to be completely unweathered, being free of limonitic staining (a recent fall?). Microprobe analyses give the following compositions: olivine, Fa24; pyroxene, Fs20; Plagioclase, An11. The meteorite is an L6 chondrite.