Sample Petrographic Description
Sample Number | GRA 98033 |
Newsletter | 22,2 |
Location | Graves Nunataks |
Field Number | 11372 |
Dimensions (cm) | 6.0 x 4.0 x 3.0 |
Weight (g) | 123.20 |
Original Classification | Eucrite (Brecciated) |
Mineral Composition (%Fa & %Fs) | |
Ferrosilite (mol%): 64 | |
Weathering | |
A/B | |
Fracturing | |
A | |
Macroscopic Description - Kathleen McBride | |
80% of the surface of this achondrite is covered with black fusion crust with shiny patches. There are several large (0.5-2.0 cm) "vugs" where sample material has weathered or has been plucked. The interior has a sugary texture, with a grayish green matrix. Black grains and some clasts are interspersed throughout the matrix. Pure white inclusions, rusty halos and streaks are visible. Several white clasts with matrix material incorporated into the clast are present. | |
Thin Section Description (,6) - Tim McCoy | |
The section consists dominantly of a mixture of mm-sized orthopyroxene (Fs64Wo2), with lamellae of augite (Fs28Wo44), and plagioclase (An88Or0.5). The Fe/Mn ratio of the pyroxene is ~30. The meteorite is a brecciated eucrite. |
Antarctic Meteorite Images for Sample GRA 98033 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample GRA 98033 | ||||
Thin Section Photo(s) : | ||||
References for Sample GRA98033 | |
Schiller, M., Dallas, J.A., Creech, J., Bizzarro, M., Baker, J.A., 2017, Tracking the formation of magma oceans in the Solar System using stable magnesium isotopes. Geochem. Persp. Let., 3, 22-31. | |
Mittlefehldt, D. W., 2015, Asteroid (4) Vesta: I. The howardite-eucrite-diogenite (HED) clan of meteorites. Chemie der Erde - Geochemistry, 75 Issue 2, Jun-15, 155-183, ISSN 0009-2819, http://dx.doi.org/10.1016/j.chemer.2014.08.002. | |
Beck, A. W., Lawrence, D. J., Peplowski, P. N., Prettyman, T. H., Mccoy, T. J., Mcsween, H. Y., Toplis, M. J., Yamashita, N., 2015, Using HED meteorites to interpret neutron and gamma-ray data from asteroidÿ4 Vesta. Meteoritics & Planetary Science, 50, 1311-1337, http://dx.doi.org/10.1111/maps.12467. | |
Warren, P. H., Kallemeyn, G. W., Huber, H., Ulff-Møller, F., Choe, W., 2009, Siderophile and other geochemical constraints on mixing relationships among HED-meteoritic breccias. Geochimica et Cosmochimica Acta, 73 Issue 19, 1-Oct-09, 5918-5943, ISSN 0016-7037, http://dx.doi.org/10.1016/j.gca.2009.06.030. |