Sample Petrographic Description
Sample Number | MIL 07409 |
Newsletter | 33,2 |
Location | Miller Range |
Field Number | 18670 |
Dimensions (cm) | 1.5 x 1.5 x 1.0 |
Weight (g) | 2.72 |
Original Classification | Acapulcoite/Lodranite |
Pairing | MIL 07259; MIL 07409; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 12-13;Ferrosilite (mol%): 4-11 | |
Weathering | |
C | |
Fracturing | |
B/C | |
Macroscopic Description - Kathleen McBride | |
40% of the exterior is covered with brown/black fusion crust with oxidation haloes. The interior matrix is friable, rusty and reveals rust-stained yellow inclusions. | |
Thin Section Description (,2) - Cari Corrigan, Tim McCoy, Linda Welzenbach | |
The section consists of an equigranular aggregate of olivine, pyroxene, plagioclase, and metal with minor sulfide and chromite, with an average grain size of 0.5 mm. Olivine (Fa12) and pyroxene (Fs11) are homogeneous. Six calcic pyroxene grains were analyzed (Fs4). Feldspars are also homogeneous (An12). This section is moderately weathered. The meteorite is probably a transitional acapulcoite-lodranite similar to, e.g., GRA 95209. |
Antarctic Meteorite Images for Sample MIL 07409 | ||||
Thin Section Photo(s) : | ||||
References for Sample MIL07409 | |
Keil, K., McCoy, T.J., 2018, Acapulcoite-lodranite meteorites: Ultramafic asteroidal partial melt residues. Chemie der Erde, 78, 153-203, https://doi.org/10.1016/j.chemer.2017.04.004. |