Name: Larkman Nunatak 12320 This is an OFFICIAL meteorite name. Abbreviation: LAR 12320 Observed fall: No Year found: 2012 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass: 120.1 g
Macroscopic Description - Kathleen McBride and Cecilia Satterwhite
The exterior surfaces have black/brown patches of fusion crust with polygonal fractures. Exposed areas without fusion crust are yellow to crème colored matrix with some gray patches. The interior matrices are fine grained, tan to weathered yellow-ochre in color, with a few darker inclusions.
Thin Section Description (,2) - Cari Corrigan and Linda Welzenbach
These sections are similar enough that one description will suffice. The sections show a groundmass of coarse (up to 1.5 mm) comminuted pyroxene, with minor plagioclase and SiO2. Plagioclase also exists as individual rounded grains. Both sections contain a pervasive porosity that gives them a strange, mottled appearance. In some areas, large relict pyroxene grains (up to 1 cm) are present (some still exhibiting exsolution), but are still mosaicized and overprinted by porosity. This gives the sections the appearance of being brecciated but without strong clast boundaries. All silicates are mosaicized. Pyroxenes are Fs14-31. Feldspars are An92-94Or0.1. The Fe/Mn ratio of the pyroxene is ~27-28. The meteorites appear to be diogenites.
JSC: Mailcode XI, 2101 NASA Parkway, NASA Johnson Space Center, Houston, TX 77058, United States; Website (institutional address; updated 28 Jul 2022) SI: Department of Mineral Sciences, NHB-119, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, United States; Website (institutional address; updated 16 Jan 2012)
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Search for this meteorite in the NASA/JSC database (U.S.):
120.1 g
