Sample Petrographic Description
Sample Number | GRA 98023 |
Newsletter | 23,1 |
Location | Graves Nunataks |
Field Number | 11938 |
Dimensions (cm) | 5.5 x 3.5 x 4.0 |
Weight (g) | 136.72 |
Original Classification | H3.8 Chondrite |
Pairing | GRA 98023; GRA 98024; GRA 98050; GRA 98087; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 3-33;Ferrosilite (mol%): 4-9 | |
Weathering | |
B | |
Fracturing | |
C | |
Macroscopic Description - Kathleen McBride | |
These meteorites have small patches of black fusion crust on a rough, rusty brown exterior. Areas without fusion crust are rusty brown with penetrating fractures. The interiors are fine-grained and rusty with large fractures and a high metal content. Some gray and weathered chondrules are visible. | |
Thin Section Description - Tim McCoy | |
A single description suffices for these meteorites. The sections exhibit numerous small, well-defined chondrules (up to 1.5 mm) in a black matrix of fine-grained silicates, metal and troilite. Weak shock effects are present. Polysynthetically twinned pyroxene is extremely abundant. The meteorites are highly weathered. Silicates are unequilibrated; olivines range from Fa3-33, with most grains Fa18, and pyroxenes from Fs4-16. The meteorites are H3 chondrites (estimated subtype 3.8). |
Antarctic Meteorite Images for Sample GRA 98023 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample GRA 98023 | ||||
Thin Section Photo(s) : | ||||
References for Sample GRA98023 | |
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. | |
Vernazza, P., and M. Lockhart , B. Zanda, R. P. Binzel, T. Hiroi, F. E. DeMeo, M. Birlan, R. Hewins, L. Ricci, P. Barge, 2014, Multiple and fast: The accretion of ordinary chondrite parent bodies. . The Astrophysical Journal , 791, 120-131, https://doi.org/10.1088/0004-637X/791/2/120. | |
RELAB, , Reflectance Experiment Lab , catalogue of samples. |