Sample Petrographic Description
Sample Number | MAC 041169 |
Newsletter | 29,1 |
Location | MacAlpine Hills |
Field Number | 15371 |
Dimensions (cm) | 1.75 x 1.5 x 0.75 |
Weight (g) | 2.00 |
Original Classification | Eucrite (Unbrecciated) |
Mineral Composition (%Fa & %Fs) | |
Ferrosilite (mol%): 57-64 | |
Weathering | |
B | |
Fracturing | |
B | |
Macroscopic Description - Kathleen McBride | |
40% rough, black fusion crust covers the exterior of this meteorite. The interior is a coarse grained black and white matrix with rusty areas. | |
Thin Section Description (,3) - Tim McCoy | |
The meteorite is a medium-grained (100-200 micron grain size), unbrecciated basalt with numerous late-stage interstitial melt pockets that can reach several hundreds of microns. Mineral compositions are relatively homogeneous with orthopyroxene (Fs57-64Wo2-5), with 1-5 micron lamellae of augite (Fs32Wo39), and plagioclase (An89Or0.5). The Fe/Mn ratio of the pyroxene is ~30. The meteorite is an unbrecciated eucrite. |
Antarctic Meteorite Images for Sample MAC 041169 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample MAC 041169 | ||||
Thin Section Photo(s) : | ||||
References for Sample MAC041169 | |
McCubbin, F.M., Lewis, J.A., Barnes, J.J., Elardo, S.M., and Boyce, J.W., 2021, The abundances of F, Cl, and H2O in eucrites: Implications for the origin of volatile depletion in the asteroid 4 Vesta. Geochimica et Cosmochimica Acta, 314, 270–293, https://doi.org/10.1016/j.gca.2021.08.021. |