Sample Petrographic Description
Sample Number | GRO 17060 |
Newsletter | 44,1 |
Location | Grosvenor Mountains |
Field Number | 25638 |
Dimensions (cm) | 6.6 x 5.0 x 4.5 |
Weight (g) | 216.10 |
Original Classification | CR2 CHONDRITE |
Updated Classification | EH3 Chondrite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 1;Ferrosilite (mol%): 1-14 | |
Weathering | |
B | |
Fracturing | |
A/B | |
Macroscopic Description - Cecilia Satterwhite | |
The exterior has 85% black/brown fusion crust with fractures and oxidation haloes. Some areas are rusty. The interior is a black matrix with white and weathered specks, minor oxidation throughout. | |
Thin Section Description (,2) - Cari Corrigan, Tim McCoy | |
The section exhibits mm-sized, well-defined, metal rich chondrules and CAI’s in a dark matrix of phyllosilicate. Weathering is locally extensive. Silicates are unequilibrated; one olivine analysis was Fa1, and pyroxenes formed two groupings at averages of Fs1Wo0.2 and Fs12Wo1. The meteorite is a CR2 chondrite. | |
Reclassification Notes (AMN 46,2) | |
Prestgard et al. (2023) report new oxygen isotope data for CR chondrites, and found three US Antarctic meteorites that are inconsistent with CR2 classification. GRO 17060 was classified in AMN 44 no. 1 as a CR2, and is reclassified as a EH3. |
Antarctic Meteorite Images for Sample GRO 17060 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample GRO 17060 | ||||
Thin Section Photo(s) : | ||||
References for Sample GRO17060 | |
Prestgard, T., Beck, P., Bonal, L., Eschrig, J., Gattacceca, J., Sonzogni, C., and Krämer Ruggiu, L., 2023, The parent bodies of CR chondrites and their secondary history, Meteoritics & Planetary Science, 58, 1117-1148, doi: 10.1111/maps.14048. |