Sample Petrographic Description
Sample Number | GRA 98006 |
Newsletter | 22,2 |
Location | Graves Nunataks |
Field Number | 11955 |
Dimensions (cm) | 6.5 x 6.0 x 2.5 |
Weight (g) | 163.70 |
Original Classification | Eucrite (Brecciated) |
Pairing | GRA 98006; GRA 98026; GRA 98044; GRA 98054; GRA 98067; GRA 98088; GRA 98103; GRA 98131; |
Mineral Composition (%Fa & %Fs) | |
Ferrosilite (mol%): 60 | |
Weathering | |
A/B | |
Fracturing | |
A | |
Macroscopic Description - Kathleen McBride | |
40% of the exterior of this achondrite is covered by thin, shiny black fusion crust. Exposed interior is medium gray in color with white and tan inclusions. The interior is a gray matrix with tan and white clasts, 1 to 4 mm in diameter. This meteorite is coherent and moderately hard. | |
Thin Section Description (,6) - Tim McCoy | |
The section consists dominantly of a mixture of mm-sized orthopyroxene (Fs60Wo3), with lamellae of augite (Fs30Wo42), and plagioclase (An90Or0.5). The Fe/Mn ratio of the pyroxene is ~30. The meteorite is brecciated and severely shocked. The meteorite is a eucrite. |
Antarctic Meteorite Images for Sample GRA 98006 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample GRA 98006 | ||||
Thin Section Photo(s) : | ||||
References for Sample GRA98006 | |
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. |