Sample No.: ALHA79022

Location: Allan Hills

Field No.: 1151

Weight (gms): 31.4

Meteorite Type: H3 Chondrite

Physical Description: Roberta Score

Stone is mostly covered with dull black fusion crust. The areas devoid of fusion crust appear to have been spalled off or preferentially plucked off because they occur along ridges. These areas are clastic and yellowish-green in color. Several fractures cut into the interior of the sample. Upon chipping, the meteorite crumbled but a relatively fresh interior was exposed. Many inclusions of various colors are visible (from black to white). The largest inclusion is white in color and 0.7 cm in its longest dimension. A small (<1 mm) weathering rind is visible. No metal is obvious but a few oxidation haloes are. Dimensions: 3.5 x 2.5 x 2 cm.

Petrographic Description: Brian Mason

Chondritic structure is well-developed, with chondrules ranging up to 1.3 mm in diameter; some have dark rims consisting largely of troilite. Intergranular glass is present in many of the chondrules; most of it is turbid and partly devitrified, but some is transparent and pale brown. The groundmass consists largely of fine-grained olivine and pyroxene, with minor amounts of nickel-iron and troilite; limonitic staining is present around the metal grains. Much of the pyroxene of variable composition: olivine, Fa1-28, average Fa17, and pyroxene, Fs9-22, average Fs16. The meteorite is classified as an H3 chondrite.