Sample Petrographic Description
Sample Number | GRO 17195 |
Newsletter | 41,2 |
Location | Grosvenor Mountains |
Field Number | 25771 |
Dimensions (cm) | 3.0 x 2.9 x 2.0 |
Weight (g) | 75.77 |
Original Classification | Iron-Ungrouped |
Weathering | |
A/B | |
Fracturing | |
A | |
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. |
Antarctic Meteorite Images for Sample GRO 17195 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample GRO 17195 | ||||
Thin Section Photo(s) : | ||||