Sample No.: ALHA82101

Location: Allan Hills

Field No.: 2908

Weight (gms): 29.1

Meteorite Type: C3O Carbonaceous Chondrite

Physical Description: Carol Schwarz

The exterior surfaces that are not covered with a shiny, blistery fusion crust are gray brown in color, contain small inclusions, and are rough on a millimeter scale. The interior is a gray beige color with a 1 mm discontinuous weathering rind. Some metal is present. The matrix is fine-grained. A few white and darker gray inclusions are present. Dimensions: 3 x 2.7 x 2.7 cm

Petrographic Description: Brian Mason

The section shows an aggregate of small chondrules (average diameter approx. 0.5 mm), chondrule fragments, and mineral grains set in a translucent yellow brown isotropic matrix. The chondrules show a wide variety of textures; in barred olivine chondrules the bars are pale brown isotropic glass. Minor amounts of nickel-iron and sulfide are present, as small grains within some chondrules and also concentrated around their margins. Microprobe analyses of olivine show a wide composition range: Fa1-50, mean Fa22; only a few grains of pyroxene were found, with compositions in the range Fs1-10. The meteorite is classified as a C3 chondrite of the Ornans subtype.