Sample No.: OTTA80301

Location: Outpost Nunatak

Field No.: 1088

Weight (gms): 35.5

Meteorite Type: H3 Chondrite

Physical Description: Roberta Score

90% of this specimen is covered with brown and black fusion crust which is pitted in some areas. One corner has been broken off to reveal a vein of weathered material from 1 to 5 mm wide, which is a much darker gray than the less weathered matrix. The interior is marked by abundant chondrules and irregular shaped inclusions. Dimensions: 3.5 x 3 x 2 cm.

Petrographic Description: Brian Mason

The section shows a close-packed aggregate of chondrules and some irregular granular enclaves; the matrix consists of fine-grained silicates with a moderate amount of nickel-iron and a lesser amount of troilite. Chondrules range up to 1.1 mm across, and show a variety of types, the commonest being granular olivine and olivine-pyroxene (polysynthetically twinned clinobronzite), porphyritic olivine, and fine-grained pyroxene. Some intergranular glass in the chondrules is clear and transparent, but much of it is turbid and partly devitrified. Minor brown limonitic staining is present around nickel-iron grains. Microprobe analyses show olivine and pyroxene with variable composition: olivine, Fa17-19, average Fa18; pyroxene, Fs4-19, average Fs10. The meteorite is tentatively classified as an H3 chondrite.