Sample Petrographic Description
Sample Number | LAR 06605 |
Newsletter | 32,2 |
Location | Larkman Nunatak |
Field Number | 19815 |
Dimensions (cm) | 3.5 x 3.5 x 1.5 |
Weight (g) | 34.61 |
Original Classification | Lodranite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 12;Ferrosilite (mol%): 12 | |
Weathering | |
B | |
Fracturing | |
B | |
Macroscopic Description - Kathleen McBride | |
The exterior has some rusty brown patches of fusion crust. The interior has a crystalline, granular texture with yellow and green to olive green grains interspersed within a mass of root beer colored matrix. | |
Thin Section Description (,4) - 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. Plagioclase occurs interstitially to mafic silicates. Olivine (Fa12) and pyroxene (Fs12) are homogeneous. The meteorite is a transitional member of the acapulcoite-lodranite clan, similar to EET 84302 and GRA 95209. |
Antarctic Meteorite Images for Sample LAR 06605 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample LAR 06605 | ||||
Thin Section Photo(s) : | ||||
References for Sample LAR06605 | |
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. | |
Lucas, M.P., Dygert, N., Ren, J., Hesse, M.A., Miller, N.R., and McSween, H.Y., 2022, Thermochemical evolution of the acapulcoite-lodranite parent body: Evidence for fragmentation-disrupted partial differentiation, Meteoritics & Planetary Science, 57:12, 1-28, doi:10.1111/maps.13930. | |
Lucas, M. P., Emery, J. P., Hiroi, T., & McSween, H. Y., 2019, Spectral properties and mineral compositions of acapulcoite–lodranite clan meteorites: Establishing S-type asteroid–meteorite connections, Meteoritics & Planetary Science, 54, 157-180. | |
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. | |
RELAB, , Reflectance Experiment Lab , catalogue of samples. |