Sample Petrographic Description
Sample Number | LEW 85306 |
Newsletter | 9,3 |
Location | Lewis Cliff |
Field Number | 2001 |
Dimensions (cm) | 2.5 x 2.5 x 1.5 |
Weight (g) | 6.50 |
Original Classification | C2 Chondrite |
Updated Classification | CM Chondrite (Anomalous) |
Pairing | LEW 85306; LEW 85307; LEW 85309; LEW 85311; LEW 85312; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 0.2-33;Ferrosilite (mol%): 0.7-5.5 | |
Weathering | |
A | |
Fracturing | |
A | |
Macroscopic Description - René Martinez | |
Frothy black fusion crust appears as patches on these stones. The interiors of these fragments have abundant light-colored clasts/chondrules that are set in a black fine-grained matrix. Thin evaporite deposit is present on 85309. Some brownish-red oxidation was noted. | |
Thin Section Description (,3) - Brian Mason | |
The section shows numerous mineral grains and aggregates and a few small (maximum diameter 0.6 mm) chondrules in a brown to black matrix. Most of the mineral grains are olivine, usually near Mg2SiO4 in composition, but some are more iron-rich. Pyroxene is less abundant, and is near MgSiO3 in composition. The meteorite is a C2 chondrite. | |
Reclassification Notes (AMN 41,1) | |
Pairing, LEW 85311 (Choe et al., 2010) |
Antarctic Meteorite Images for Sample LEW 85306 | ||||
Thin Section Photo(s) : | ||||
References for Sample LEW85306 | |
Alexander, C.M.O'D., Wynn, J.G., and Bowden, R., 2022, Sulfur abundances and isotopic compositions in bulk carbonaceous chondrites and insoluble organic material: Clues to elemental and isotopic fractions of volatile chalcophiles, Meteoritics & Planetary Science, 57, 334-351, doi:10.1111/maps.13746. | |
Rochette, P., Kohout, T., Pesonen, L., Quirico, E., Sagnotti, L., Skripnik, A., Gattacceca, J., Bonal, L., Bourot-Denise, M., Chevrier, V., Clerc, J. P., Consolmagno, G., Folco, L., Gounelle, M., 2008, Magnetic classification of stony meteorites: 2. Non-ordinary chondrites. Meteoritics & Planetary Science, 43, 959-980, http://dx.doi.org/10.1111/j.1945-5100.2008.tb01092.x. | |
Marvin, U. B., MacPherson, G. J., 1992, Field and Laboratory Investigations of Antarctica Meteorites Collected by United States Expeditions, Smithsonian Contributions to the Earth Sciences Number, 30, 116. |