Sample Petrographic Description
Sample Number | MAC 041193 |
Newsletter | 29,2 |
Location | MacAlpine Hills |
Field Number | 15807 |
Dimensions (cm) | 1.0 x 1.5 x 0.5 |
Weight (g) | 1.32 |
Original Classification | Acapulcoite/Lodranite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 11;Ferrosilite (mol%): 11 | |
Weathering | |
B | |
Fracturing | |
A/B | |
Thin Section Description (,2) - Tim McCoy | |
The section exhibits a granoblastic texture with abundant triple junctions and grain sizes of 100-300 microns. Olivine, pyroxene, plagioclase and coarse metal are uniformly distributed, but sulfide is markedly depleted relative to chondrites. Olivine is Fa11, pyroxene is Fs11Wo2 and plagioclase is An15Or5. The meteorite is a member of the acapulcoite-lodranite clan. It is not paired with MAC 88177, but is similar in some respects to the transitional members EET 84302 and GRA 95209. |
References for Sample MAC041193 | |
Tomkins, A.G., Johnson, T.E., Mitchell, J.T., 2020, A review of the chondrite-achondrite transition, and a metamorphic facies series for equilibrated primitive stony meteorites. Meteoritics & Planetary Science, 55, 857-885, doi: 10.1111/maps.13472. | |
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. |