Sample Petrographic Description
Sample Number | LEW 88328 |
Newsletter | 14,2 |
Location | Lewis Cliff |
Field Number | 6089 |
Dimensions (cm) | 3.9 x 3.4 x 2.1 |
Weight (g) | 43.15 |
Original Classification | L3 Chondrite |
Updated Classification | L3.7 Chondrite |
Pairing | LEW 88328; LEW 88594; LEW 88621; LEW 88696; LEW 93891; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 8-28;Ferrosilite (mol%): 10-24 | |
Weathering | |
C | |
Fracturing | |
A | |
Macroscopic Description - Robbie Marlow | |
Smooth dark brown fusion crust covers approximately 80% of this otherwise extremely weathered stone. | |
Thin Section Description (,2) - Brian Mason | |
The section shows abundant chondrules and chondrule fragments, up to 1.8 mm across, in a finely granular matrix of olivine and pyroxene with minor nickel-iron and troilite. Weathering is extensive, with brown limonitic staining and small patches of limonite throughout the section. Microprobe analyses show olivine and pyroxene of variable composition: olivine, Fa8-28, mean Fa20 (CV FeO is 22); pyroxene, Fs10-24. The variability of olivine and pyroxene compositions indicates type 3, and the small amount of nickel-iron L group, hence the meteorite is classified as an L3 chondrite (estimated L3.7). | |
Reclassification Notes (AMN OUTSIDE) | |
Classification updated to L3.7 in Meteoritical Bulletin 76. | |
Notes | |
Righter et al. (2021) proposed that LEW 88328, LEW 88594, LEW 88621, LEW 88696, LEW 93891 are paired and Type L3.7. |
Antarctic Meteorite Images for Sample LEW 88328 | ||||
Thin Section Photo(s) : | ||||
References for Sample LEW88328 | |
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. | |
RELAB, , Reflectance Experiment Lab , catalogue of samples. |