Sample Petrographic Description
Sample Number | LEW 85307 |
Newsletter | 10,1 |
Location | Lewis Cliff |
Field Number | 3178 |
Dimensions (cm) | 2.0 x 1.0 x 1.0 |
Weight (g) | 1.71 |
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%): 0.6-46 | |
Weathering | |
A | |
Fracturing | |
A | |
Macroscopic Description - René Martinez | |
LEW85307 is rounded and is totally covered with smooth fusion crust. Numerous <1 mm-sized white inclusions are present in the black matrix. | |
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. LEW85307 as well as 85009, 85011, and 85012 are very similar to LEW85306 and probably paired with it. | |
Reclassification Notes (AMN 41,1) | |
Pairing, LEW 85311 (Choe et al., 2010) |
Antarctic Meteorite Images for Sample LEW 85307 | ||||
Thin Section Photo(s) : | ||||
References for Sample LEW85307 | |
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. | |
Zolensky, M. E., Barrett, R., Browning, L., 1993, Mineralogy and composition of matrix and chondrule rims in carbonaceous chondrites. Geochimica et Cosmochimica Acta, 57 Issue 13, Jul-93, 3123-3148, ISSN 0016-7037, http://dx.doi.org/10.1016/0016-7037(93)90298-B. | |
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. |