Sample Petrographic Description
Sample Number | MIL 090031 |
Newsletter | 35,2 |
Location | Miller Range |
Field Number | 20441 |
Dimensions (cm) | 9.2 x 4.8 x 4.7 |
Weight (g) | 500.10 |
Original Classification | Ureilite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 20;Ferrosilite (mol%): 17 | |
Weathering | |
B/C | |
Fracturing | |
A/B | |
Macroscopic Description - Cecilia Satterwhite | |
Black fusion crust covers 60% of the exterior with oxidation haloes. Areas without fusion crust are rusty brown and fractures penetrate the surface. The interior matrix is dark gray to black with discontinuous oxidation rind and rusty areas. Some crystalline faces are visible in the coarse grained texture. | |
Thin Section Description (,2) - Cari Corrigan, Tim McCoy, Nicole Lunning | |
The section consists of an aggregate of large olivine and pyroxene grains up to 2 mm across. Individual olivine grains are rimmed by carbon-rich material containing traces of metal. The olivines have been mosaicized by shock. Olivines has cores of Fa20, with rims reduced to Fa15. Pigeonite (Fs17,Wo8) exhibits a blotchy appearance. The meteorite is a ureilite. |
Antarctic Meteorite Images for Sample MIL 090031 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample MIL 090031 | ||||
Thin Section Photo(s) : | ||||
References for Sample MIL090031 | |
Budde, G., Kruijer, T. S, Fischer-Godde, M., Irving, A. J., Kleine, T., 2015, Planetesimal differentiation revealed by the Hf-W systematics of ureilites. Earth and Planetary Science Letters, 430, 15-Nov-15, 316-325, ISSN 0012-821X, http://dx.doi.org/10.1016/j.epsl.2015.08.034. |