Sample Petrographic Description
Sample Number | RBT 04251 |
Newsletter | 30,2 |
Location | Roberts Massif |
Field Number | 16304 |
Dimensions (cm) | 2.0 x 2.0 x 1.5 |
Weight (g) | 19.54 |
Original Classification | H3 Chondrite |
Updated Classification | H3.4 Chondrite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 1-20;Ferrosilite (mol%): 1-6 | |
Weathering | |
B | |
Fracturing | |
A/B | |
Macroscopic Description - Kathleen McBride | |
100% of the exterior is covered by brown/black fusion crust with oxidation haloes. The interior is a rusty black matrix with gray chondrules and a high metal content. | |
Thin Section Description (,2) - Tim McCoy, Lauren LaCroix, Linda Welzenbach | |
The section exhibits numerous well-defined chondrules of a range of sizes (up to 2.6 mm) in a black matrix of fine-grained silicates, metal and troilite. Weak shock effects and weathering are present. Silicates are unequilibrated; olivines range from Fa1-20 and pyroxenes from Fs1-6. The meteorite is an H3 chondrite (estimated subtype 3.4). | |
Reclassification Notes (AMN 30,2) | |
Classification updated to H3.4. |
Antarctic Meteorite Images for Sample RBT 04251 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample RBT 04251 | ||||
Thin Section Photo(s) : | ||||
References for Sample RBT04251 | |
Eschrig, J., Bonal, L., Mahlke, M., Carry,B., Beck, P., Gattacceca, J., 2022, Investigating S-type asteroid surfaces through reflectance spectra of ordinary chondrites, Icarus, 381. | |
Eschrig, J., Bonal, L., Beck, P., Prestgard, T.J., 2021, Spectral reflectance analysis of type 3 carbonaceous chondrites and search for their asteroidal parent bodies. Icarus, 354, 114034, https://doi.org/10.1016/j.icarus.2020.114034. | |
Bonal, L., Quirico, E., Flandinet, L., Montagnac, G., 2016, Thermal history of type 3 chondrites from the Antarctic meteorite collection determined by Raman spectroscopy of their polyaromatic carbonaceous matter. Geochimica et Cosmochimica Acta, 189, 312-337. |