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78.57 grams. 5.5 x 3.5 x 2.5 cm   Martian (shergottite)

TKW 78.6 grams. Fall not observed. Found 2006, Larkman Nunatak, Australia.

Location Map of Antarctic Finds

AMN writes:

Macroscopic Description - Kathleen McBride

The exterior has 60% dark brown to black fusion crust with very fine grained wrinkled texture. The fusion crust exhibits a slight sheen. The interior is a gray and black matrix that is fine grained and very hard.

Thin Section Description (,2) - Tim McCoy, Lauren LaCroix and Linda Welzenbach

The section is composed of a coarse-grained assemblage of pyroxene, olivine and maskelynite. Olivine occurs as phenocrysts with grain sizes up to 2.5 mm. Pyroxene and maskelynite in the matrix are finer grained, typically reaching 0.5 mm. Sulfides and oxides are present, as are shock melt veins. Olivine is Fa25-48; pyroxenes exhibit a range of compositions from pigeonite to subcalcic augite (Fs25-51Wo5-31; Fe/Mn ~ 23-35); feldspar is intermediate in composition (An46-52). The meteorite is an olivine-phyric shergottite.

Oxygen Isotopic Composition - Z. Sharp, University of New Mexico

Oxygen isotopic analyses of two small (2-5 mg) pieces yielded the following results which fall in the martian meteorite field: ä17O = 2.85, ä18O = 4.85, Ä17O = 0.33 ä17O = 2.83, ä18O = 4.92, Ä17O = 0.27 [where Ä17O = ä17O - 0.52 x ä18O]