Sample Petrographic Description
Sample Number | RBT 04255 |
Newsletter | 30,2 |
Location | Roberts Massif |
Field Number | 16342 |
Dimensions (cm) | 2.5 x 2.0 x 1.0 |
Weight (g) | 10.17 |
Original Classification | Achon. Ungrouped |
Pairing | RBT 04239; RBT 04255; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 24;Ferrosilite (mol%): 21 | |
Weathering | |
C | |
Fracturing | |
B | |
Macroscopic Description - Kathleen McBride | |
90% thick brown/black fusion crust covers the exterior surface. The interior is a rusty black matrix with metal and is hard. | |
Thin Section Description - Tim McCoy, Lauren LaCroix, Linda Welzenbach | |
The meteorite is paired with RBT 04239, which was described as follows: The section consists of an olivine-rich groundmass with pyroxene, plagioclase, metal and troilite present. Micron-sized metal-sulfide veinlets are abundant and a few relict chondrules are present. Olivine is Fa24, orthopyroxene is Fs20Wo2, clinopyroxene is Fs8Wo44 and plagioclase is An10Or5. The meteorite may be an ungrouped primitive achondrite and has some similarities to the Divnoe meteorite (Petaev et al., Meteoritics, 29, 182). |
Antarctic Meteorite Images for Sample RBT 04255 | ||||
Thin Section Photo(s) : | ||||
References for Sample RBT04255 | |
Greenwood, R.C., Burbine, T.H., and Franchi, I.A., 2020, Linking Asteroids and meteorites to the primordial planetesimal population. Geochimica et Cosmochimica Acta, 277, 377-406, doi: 10.1016/j.gca.2020.02.004. | |
Greenwood, R. C., Burbine, T. H., Miller, M. F., & Franchi, I. A. , 2017, Melting and differentiation of early-formed asteroids: The perspective from high precision oxygen isotope studies. . Chemie Der Erde-Geochemistry, 77, 1-43, http://dx.doi.org/10.1016/j.chemer.2016.09.005. | |
McCoy, T.J., 2015, Meteorite Misfits: Fuzzy Clues to Solar System Processes. In Righter, K., Corrigan, C.M., McCoy, T.J., and Harvey, R.P. Meteorites: A Pictorial Guide to the Collection, First Edition, AGU Wiley, pp. 145-152. |