Sample Petrographic Description
Sample Number | LEW 88632 |
Newsletter | 14,2 |
Location | Lewis Cliff |
Field Number | 6115 |
Dimensions (cm) | 2.5 x 1.5 x 1.3 |
Weight (g) | 10.25 |
Original Classification | L3 Chondrite |
Updated Classification | L3.6 Chondrite |
Pairing | LEW 85396; LEW 85452; LEW 86347; LEW 88146; LEW 88632; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 2-21;Ferrosilite (mol%): 8-23 | |
Weathering | |
B/C | |
Fracturing | |
A | |
Macroscopic Description - Cecilia Satterwhite | |
This weathered chondrite has 80% of its exterior covered with fusion crust. The dark brown interior contains numerous chondrules. Some metal is still obvious. | |
Thin Section Description (,2) - Brian Mason | |
The section shows a close-packed aggregate of chondrules and chondrule fragments, up to 1.8 mm across, in a fine-grained matrix of olivine and pyroxene with minor amounts of nickel-iron and troilite. Brown limonitic staining pervades the section. Microprobe analyses show olivine and pyroxene of variable composition: olivine, Fa2-21, mean Fa12 (CV FeO is 37); pyroxene, Fs8-23. The variability of olivine and pyroxene compositions indicates type 3, and the amount of nickel-iron L group, hence the meteorite is classified as an L3 chondrite (estimated L3.6). | |
Reclassification Notes (AMN OUTSIDE) | |
Classification updated to L3.6 in Meteoritical Bulletin 76. | |
Notes | |
Righter et al. (2021) proposed that LEW 85396, LEW 85452, LEW 86347, LEW 88146 are all paired type L3.6. LEW 88632 was mistakenly listed as L3.5 in Righter et al. (2021) - it is L3.6, and should thus also be paired with LEW 85396. |
Antarctic Meteorite Images for Sample LEW 88632 | ||||
Thin Section Photo(s) : | ||||
References for Sample LEW88632 | |
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. | |
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. |