Sample Petrographic Description
Sample Number | GRO 03015 |
Newsletter | 29,1 |
Location | Grosvenor Mountains |
Field Number | 15636 |
Dimensions (cm) | 10.0 x 5.5 x 5.0 |
Weight (g) | 480.00 |
Original Classification | L3 Chondrite |
Updated Classification | L3.10 Chondrite |
Pairing | GRO 03015; GRO 03061; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 1-29;Ferrosilite (mol%): 3-29 | |
Weathering | |
Be | |
Fracturing | |
A | |
Macroscopic Description - Kathleen McBride | |
The exteriors of these ordinary chondrites have dull, black weathered fusion crust with polygonal fractures. The interiors are a dark matrix stained with rust. Numerous chondrules and a few irregularly shaped clasts are visible. Metal is also present. | |
Thin Section Description (,2) - Tim McCoy, Linda Welzenbach | |
The meteorites are so similar that a single description suffices. The sections exhibit numerous well-defined chondrules (up to 1.5 mm) in a black matrix of fine-grained silicates, metal and troilite. Polysynthetically twinned pyroxene is abundant. Silicates are unequilibrated; olivines range from Fa1-29 and pyroxenes from Fs3-29. The meteorites are L3 chondrites (estimated subtype 3.6). | |
Reclassification Notes (AMN 44,2) | |
Reclassified as an L3.10 Chondrite based on Cr contents of Type II chondrule olivine. Righter, K., Schutt, J., Lunning, N., Harvey, R., & Karner, J. (2021) Identification and pairing reassessment of unequilibrated ordinary chondrites from four Antarctic dense collection areas. Meteoritics & Planetary Science 56, 1556-1578. | |
Notes | |
Righter et al. (2021) propose the GRO 03015 and GRO 03061 are paired and both type L3.10. |
Antarctic Meteorite Images for Sample GRO 03015 | ||||
Lab Photo(s) : | ||||
References for Sample GRO03015 | |
Righter, K., Schutt, J., Lunning, N., Harvey, R, and Karner, J., 2021, Identification and pairing reassessment of unequilibrated ordinary chondrites from four Antarctic dense collection areas. Meteoritics & Planetary Science, 56, 1556-1573, doi: 10.1111/maps.13707. |