Sample Petrographic Description
Sample Number | LEW 85309 |
Newsletter | 9,3 |
Location | Lewis Cliff |
Field Number | 2047 |
Dimensions (cm) | 6.0 x 3.5 x 3.0 |
Weight (g) | 54.14 |
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%): 0.2-41;Ferrosilite (mol%): 0.9-1.5 | |
Weathering | |
A/Be | |
Fracturing | |
B/C | |
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 85309 | ||||
Thin Section Photo(s) : | ||||
References for Sample LEW85309 | |
Hiroi, T., Ohtsuka, K., Howard, K.T., Robertson, K.R., and Milliken, R.E., Kaiden, H., Imae, N., Misawa, K., Kojima, H., Sasakia, S., Matsuokaa, M., Nakamura, T., Bish, D.L., 2021, UV-visible-infrared spectral survey of Antarctic carbonaceous chondrite chips. Polar Science, 29, 100723, https://doi.org/10.1016/j.polar.2021.100723. | |
Kaplan, H.H., Connolly, H.C., Dotto, E., Emery, J.P., Fornasier, S., Lantz, C., Lim, L.F., Merlin, F., Praet, A., Reuter, D.C., Sanford, S.A., Hamilton, V.E., Simon, A.A., Takir, D., and Lauretta, D.S., Howell, E.S., Anderson, F.S., Barrucci, M.A., Brucato, J., Burbine, T.H., Clark, B.E., Cloutis, E.A., 2020, Visible-near infrared spectral indices for mapping mineralogy and chemistry with OSIRIS-Rex. Meteoritics & Planetary Science, 55, 744-765, doi: 10.111/maps.13461. | |
Benoit, P. H., Sears, D. W. G., Akridge, J. M. C., Bland, P. A., Berry, F. J., Pillinger, C. T., 2000, The non-trivial problem of meteorite pairing. Meteoritics & Planetary Science, 35, 393-417. | |
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. | |
RELAB, , Reflectance Experiment Lab , catalogue of samples. |