Sample No.: ALHA77284

Location: Allan Hills

Field No.: Y78010501

Weight (gms): 376.2

Meteorite Type: L6 Chondrite

Physical Description:

The fusion crust on this angular stone is less than .5 mm thick, dull black, and covers all but the B surface, which is a planar fracture surface. Rounded and irregular clasts are visible in some areas on the B surface. One large fracture runs the length of the sample. The specimen is approximately 11.0x8.0x3.5 cm. The material exposed during chipping to obtain a thin section sample, is grayish-white and exhibits a few small metallic flakes. A thin, 1 mm, weathering rind is apparent along the T, S, and N surfaces.

Petrographic Description: Brian Mason

The thin section shows sparse chondrules with indistinct borders merging with the granular groundmass, which consists largely of olivine and orthopyroxene, with minor subequal amounts of nickel-iron and troilite, and a little untwinned plagioclase. Some limonite is present, mainly in association with the nickel-iron. Microprobe analyses show olivine (Fa25), orthopyroxene (Fs21), and plagioclase (An11) of uniform composition; one grain of apatite was identified with the microprobe. The meteorite is classified as an L6 chondrite.