Sample Petrographic Description
Sample Number | MIL 090405 |
Newsletter | 35,2 |
Location | Miller Range |
Field Number | 20964 |
Dimensions (cm) | 3.0 x 3.0 x 2.8 |
Weight (g) | 58.84 |
Original Classification | Achon. Ungrouped |
Pairing | MIL 090405; MIL 090206; MIL 090340; MIL 090356; MIL 090805; MIL 090963; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 29-32;Ferrosilite (mol%): 10 | |
Weathering | |
B | |
Fracturing | |
A | |
Macroscopic Description - Cecilia Satterwhite | |
Brown/black fusion crust covers 70% of the surface with some oxidation. The interior matrix is dark gray to black in color with a crystalline texture and some oxidation and metal. | |
Thin Section Description (,2) - Cari Corrigan, Andrew Beck, Nicole Lunning | |
This section consists of an aggregate of equigranular (up to 1 mm) olivine grains. Individual olivine grains are rimmed by dark material containing finely dispersed grains of metal, sulfide, and chromite. Olivine has compositions of Fa29. Pyroxene analyses are Fs11Wo44. This meteorite looks superficially like a ureilite, but given the recent abstract by Warren and Rubin (2012, LPSC 43, #2528), we will classify it as an ungrouped achondrite. This meteorite is likely paired with MIL 090963. |
Antarctic Meteorite Images for Sample MIL 090405 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample MIL 090405 | ||||
Thin Section Photo(s) : | ||||
References for Sample MIL090405 | |
Day, J. M., Corder, C. A., Assayag, N., & Cartigny, P., 2019, Ferrous oxide-rich asteroid achondrites. Geochimica et Cosmochimica Acta, 266, 544-567, https://doi.org/10.1016/j.gca.2019.04.005. | |
Hasegawa, H., Mikouchi, T., Yamaguchi, A., Yasutake, M., Greenwood, R. C., & Franchi, I. A., 2019, Petrological, petrofabric, and oxygen isotopic study of five ungrouped meteorites related to brachinites. Meteoritics & Planetary Science, 54, 752-767. | |
McCoy, T.J., 2015, Meteorite Misfits: Fuzzy Clues to Solar System Processes. In Righter, K., Corrigan, C.M., McCoy, T.J., and Harvey, R.P. Meteorites: A Pictorial Guide to the Collection, First Edition, AGU Wiley, pp. 145-152. | |
RELAB, , Reflectance Experiment Lab , catalogue of samples. |