Sample No.: ALHA78130

Location: Allan Hills

Field No.: 336

Weight (gms): 2733.0

Meteorite Type: L6 Chondrite

Physical Description:

This specimen, 18 x 9 x 9 cm , is completely covered with a thin, dull black fusion crust, with the exception, of an ~4 x 4 cm. area on the W surface and along the edges of the sample. Preferential weathering of the fusion crust around included clasts occurs. The sample is covered with shallow regmaglypts and several large fractures penetrate the sample. Chipping of the sample during processing revealed a severely oxidized interior for ~70% of the sample. The unweathered portion is light gray and speckled with light and dark clasts, ~1-2 mm.. Several larger (~0.5 cm.) gray clasts were noted. Small veins of a darker gray material, ~2-3 cm. in length and 3 mm. wide, are present in the lighter matrix material.

Petrographic Description: Brian Mason

Chondrules are sparse and poorly defined, their borders tending to merge with the granular groundmass, which consists largely of olivine and pyroxene with minor subequal amounts of nickel-iron and troilite, plagioclase, and accessory chromite. A moderate amount of brown limonitic staining is present around the nickel-iron grains. Microprobe analyses give the following compositions: olivine, Fa25; pyroxene, Fs21; plagioclase, An10. The meteorite is an L6 chondrite. ALHA78130, 78131 are L6 chondrites similar in all respects to ALHA78126.