Sample No.: ALHA78074

Location: Allan Hills

Field No.: 280

Weight (gms): 200.2

Meteorite Type: L6 Chondrite

Physical Description:

This is not a complete specimen. Shiny fusion crust (1-2mm thick) covers B, W, and portions of S, N, and E surfaces. Polygonal fractures are present on the B and N surfaces. Where fracture surfaces are present they are rough and slightly weathered and stained by iron oxidation. The matrix of the sample is light gray and included clasts and chondrules are darker gray. Some oxidation halos are apparent.

Petrographic Description: Brian Mason

Chondrules are sparse and poorly developed, with margins that tend to merge with the granular groundmass, which consists largely of olivine and pyroxene, with minor subequal amounts of nickel-iron and troilite and some plagioclase; accessory chromite was noted. Well preserved fusion crust, 0.4 mm thick, is present along one edge of the section. A minor amount of brown limonitic staining occurs immediately below the fusion crust. Microprobe analyses give the following compositions: olivine, Fa24-orthopyroxene, Fs21; plagioclase, An10. The meteorite is classified as an L6 chondrite.