Sample No.: ALHA77285

Location: Allan Hills

Field No.: Y78010510

Weight (gms): 271.1

Meteorite Type: H6 Chondrite

Physical Description:

This semi-rounded specimen is approximately 5.0x6.0x6.5 cm, the B and S surfaces are flat. The sample is made up of three individual pieces that fit together; one of these pieces was generated in transport. A small, less than 2 cm, patch of dull, black, fusion crust is present on the B surface. The exterior of the meteorite has a reddish-brown patina. All interior surfaces of the meteorite are weathered and range in color from orangish-brown to reddish-brown. No unweathered material was exposed while attempting to obtain suitable material for thin sections. Ice was present on the sample when it was removed from cold storage.

Petrographic Description: Brian Mason

The section shows sparse and poorly defined chondrules tending to merge with the granular groundmass, which consists largely of olivine and orthopyroxene, with minor amounts of nickel-iron, troilite in lesser quantity, and plagioclase. The meteorite is extensively weathered, with brown staining and veins and patches of limonite throughout the section. Microprobe analyses show olivine (Fa18), orthopyroxene (Fs16), and plagioclase (An12) of uniform composition. The meteorite is classified as an H6 chondrite.