Sample Petrographic Description
Sample Number | MIL 11290 |
Newsletter | 37,2 |
Location | Miller Range |
Field Number | 21553 |
Dimensions (cm) | 8.0 x 6.0 x 4.0 |
Weight (g) | 327.10 |
Original Classification | Eucrite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 80;Ferrosilite (mol%): 44-67 | |
Weathering | |
Ae | |
Fracturing | |
A | |
Macroscopic Description - Mitchell Haller | |
95% of the exterior of this achondrite has jet black fusion crust, glassy and minor rust in areas. The interior matrix is gray with white inclusions, and some minor oxidation. | |
Thin Section Description (,2) - Cari Corrigan, Linda Welzenbach, Pamela Salyer | |
This meteorite is dominated by coarse-grained basaltic material. Feldspar laths are up to 1.5 mm. Pyroxene grains are also up to 1.5 mm. One finer-grained clast exists, with grain sizes up to 0.5 mm (also pyroxene and feldspar). Mineral compositions are orthopyroxene (Fs59-67Wo3-5), with lamellae of augite (Fs50Wo20, although lamellae were too small to get pure end-member compositions), and plagioclase (An78-85Or0.8-1.7). One olivine analysis was Fa80. The Fe/Mn ratio of the pyroxene is 29-34. The meteorite is a eucrite. |
Antarctic Meteorite Images for Sample MIL 11290 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample MIL 11290 | ||||
Thin Section Photo(s) : | ||||
References for Sample MIL11290 | |
Dyar, M.D., Wallace, S.M., Burbine, T.H., and Sheldon, D.R., 2023, A machine learning classification of meteorite spectra applied to understanding asteroids. Icarus, 406, 115718, https://doi.org/10.1016/j.icarus.2023.115718. | |
Bekaert, D.V., Curtice, J., Meier, M.M.M., Byrne, D.J., Broadley, M.W., Seltzer, A., Barry, P., Kurz, M.D., and Nielsen, S.G., 2022, Determining the noble gas cosmic ray exposure ages of 23 meteorites (8 chondrites and 15 achondrites) from modeling and empirical methods, Meteoritics & Planetary Science, 57:8, 1-28, doi:10.1111/maps.13887. | |
Mittlefehldt, D.W., Greenwood, R.C., Berger, E.L., Le, L., Peng, Z.X., and Ross, D.K., 2022, Eucrite-type achondrites: Petrology and oxygen isotope compositions, Meteoritics & Planetary Science, 57, 484-526, doi:10.1111/maps.13730. | |
Wu, N., Farquhar, J., Dottin, J. W. , Magalhães, N., 2018, Sulfur isotope signatures of eucrites and diogenites,. Geochimica et Cosmochimica Acta, 233, 1-13, https://doi.org/10.1016/j.gca.2018.05.002. | |
RELAB, , Reflectance Experiment Lab , catalogue of samples. |