Name: Grosvenor Mountains 17195 This is an OFFICIAL meteorite name. Abbreviation: GRO 17195 Observed fall: No Year found: 2017 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass: 75.8 g
Macroscopic Description - Cari Corrigan, Nicole Lunning, Tim McCoy
This very small meteorite is roughly equidimensional triangular shaped and measures 3x3x2 cm. The meteorite appears to have been lodged in soil with one side slightly flattened and coated in evaporite deposits. The rounded, upper side exhibits a pronounced Widmanstätten pattern on the exterior surface formed by preferential ablation by windborne particles in Antarctica. The exposed Widmanstätten pattern has band widths of ~1 mm, suggesting a medium octahedrite.
Thin Section Description (,2) - Cari Corrigan, Nicole Lunning, Tim McCoy
This thick section exhibits a well-developed Widmanstätten pattern with kamacite lamellae average width of 0.6 mm. Taenite exhibits extensive plessite development. Throughout the section, α2 structure is present suggesting reheating. Single inclusions of chromite and schreibersite were observed. Fusion crust is absent but a few pockets of micromelting and dendritic crystallization were observed at the weathered surface. Compositionally, this iron has 10.1 wt.% Ni, and 0.04 wt.% P, determined from microprobe transects. The relatively high Ni and low P concentrations are unlike any of the major groups, suggesting an ungrouped classification.
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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75.8 g
