Sample Petrographic Description
Sample Number | LEW 88617 |
Newsletter | 15,2 |
Location | Lewis Cliff |
Field Number | 5525 |
Dimensions (cm) | 1.9 x 1.1 x 1.1 |
Weight (g) | 3.15 |
Original Classification | L3 Chondrite |
Updated Classification | L3.5 Chondrite |
Pairing | LEW 86408; LEW 86417; LEW 86436; LEW 86495; LEW 88286; LEW 88617; LEW 88644; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 2-44;Ferrosilite (mol%): 1-14 | |
Weathering | |
B/C | |
Fracturing | |
A | |
Macroscopic Description - Robbie Marlow | |
LEW88617 is approximately 75% covered with dull, black fusion crust. Interior matrix is medium gray and there are areas of heavy oxidation. Several millimeter-sized light and dark inclusions are visible. | |
Thin Section Description (,2) - Brian Mason | |
The section shows numerous chondrules and chondrule fragments, up to 1.8 mm across, in a dark matrix containing little nickel-iron and troilite. Weathering is extensive, with brown limonitic staining throughout the section. Microprobe analyses show olivine and pyroxene of variable compositions: olivine, Fa2-44, mean Fa22 (CV FeO is 41); pyroxene, Fs1-14. The meteorite is classified as an L3 chondrite (estimated L3.5). | |
Reclassification Notes (AMN OUTSIDE) | |
Classification updated to L3.5 in Meteoritical Bulletin 76. | |
Notes | |
Righter et al. (2021) proposed that LEW 86408, LEW 86417, LEW 86436, LEW 86495, LEW 88286, LEW 88617, and LEW 88644 are all paired type L3.5. |
Antarctic Meteorite Images for Sample LEW 88617 | ||||
Thin Section Photo(s) : | ||||
References for Sample LEW88617 | |
Eschrig, J., Bonal, L., Mahlke, M., Carry,B., Beck, P., Gattacceca, J., 2022, Investigating S-type asteroid surfaces through reflectance spectra of ordinary chondrites, Icarus, 381. | |
Eschrig, J., Bonal, L., Beck, P., Prestgard, T.J., 2021, Spectral reflectance analysis of type 3 carbonaceous chondrites and search for their asteroidal parent bodies. Icarus, 354, 114034, https://doi.org/10.1016/j.icarus.2020.114034. |