Sample Petrographic Description
| Sample Number | RBT 04239 |
| Newsletter | 29,2 |
| Location | Roberts Massif |
| Field Number | 16319 |
| Dimensions (cm) | 2.5 x 2.0 x 1.25 |
| Weight (g) | 11.96 |
| Original Classification | Achon. Ungrouped |
| Mineral Composition (%Fa & %Fs) | |
| Fayalite (mol%): 24;Ferrosilite (mol%): 20 | |
| Weathering | |
| C | |
| Fracturing | |
| A/B | |
| Macroscopic Description - Kathleen McBride | |
| 90% of the exterior has brown/black fusion crust with polygonal fractures and oxidation halos. The interior is rusty black with high metal content. | |
| Thin Section Description (,2) - Tim McCoy | |
| 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 04239 | ||||
| Field Photo(s) : | ||||
 |
||||
| Field photo image(s) courtesy of the ANSMET (ANtarctic Search for METeorites) Program, Case Western Reserve University and the University of Utah | ||||
| References for Sample RBT04239 | |
| 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. | |
| 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 . | |