Sample Petrographic Description
Sample Number | LEW 97202 |
Newsletter | 23,2 |
Location | Lewis Cliff |
Field Number | 9202 |
Dimensions (cm) | 7.0 x 3.0 x 2.5 |
Weight (g) | 117.60 |
Original Classification | L3 Chondrite |
Updated Classification | L3.05 Chondrite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 1-33;Ferrosilite (mol%): 3-10 | |
Weathering | |
C | |
Fracturing | |
B | |
Macroscopic Description - Kathleen McBride | |
75% of the exterior of this meteorite has brown/black fusion crust with polygonal fractures and oxidation. The interior is rusty with a few light colored, mm sized chondrules. The meteorite is hard and contains numerous metal grains. | |
Thin Section Description (,2) - Tim McCoy | |
The section exhibits numerous well-defined chondrules (up to 2 mm) in a black matrix of fine-grained silicates, metal and troilite. Polysynthetically twinned pyroxene is extremely abundant. Silicates are unequilibrated; olivines range from Fa1-33 and pyroxenes from Fs3-10. The meteorite is an L3 chondrite (estimated subtype 3.4). | |
Reclassification Notes (AMN 44,2) | |
Reclassified as an L3.05 Chondrite based on Cr contents of Type II chondrule olivine. Righter, K., Schutt, J., Lunning, N., Harvey, R., & Karner, J. (2021a) Identification and pairing reassessment of unequilibrated ordinary chondrites from four Antarctic dense collection areas. Meteoritics & Planetary Science 56, 1556-1578. |
Antarctic Meteorite Images for Sample LEW 97202 | ||||
Lab Photo(s) : | ||||
References for Sample LEW97202 | |
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. |