Sample Petrographic Description
| Sample Number | MET 00423 |
| Newsletter | 24,2 |
| Location | Meteorite Hills |
| Field Number | 13556 |
| Dimensions (cm) | 6.0 x 4.0 x 3.5 |
| Weight (g) | 79.38 |
| Original Classification | Howardite |
| Mineral Composition (%Fa & %Fs) | |
| Ferrosilite (mol%): 20-53 | |
| Weathering | |
| A/B | |
| Fracturing | |
| A/B | |
| Macroscopic Description - Kathleen McBride | |
| ~40% of the exterior surface is covered by dark brown fusion crust that has shiny, black patches. The surface contains "vugs" or areas where material has been plucked or weathered out. The fine-grained medium gray matrix has numerous euhedral clasts in various colors - gray, black, tan and white. | |
| Thin Section Description (,2) - Tim McCoy, Linda Welzenbach | |
| The section shows a groundmass of comminuted pyroxene and plagioclase (up to 1 mm) with medium- to coarse-grained basaltic clasts ranging up to 3 mm. Pyroxene includes orthopyroxene (Fs20-53Wo1-3) and exsolved pyroxenes of Fs49Wo5 to Fs22Wo38. The Fe/Mn ratio is ~30. Plagioclase is An78-93Or0-1. The meteorite is a howardite. | |
| Antarctic Meteorite Images for Sample MET 00423 | ||||
| Field Photo(s) : | ||||
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| Field photo image(s) courtesy of the ANSMET (ANtarctic Search for METeorites) Program, Case Western Reserve University and the University of Utah | ||||
| Antarctic Meteorite Images for Sample MET 00423 | ||||
| Lab Photo(s) : | ||||
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| References for Sample MET00423 | |
| Moriarty, D. P., Pieters, C. M., 2016, Complexities in pyroxene compositions derived from absorption band centers: Examples from Apollo samples, HED meteorites, synthetic pure pyroxenes, and remote sensing data. Meteoritics & Planetary Science, 51(2), 207-234. | |
| 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. | |
| Mittlefehldt, D. W., Herrin, J. S., Quinn, J. E., Mertzman, S. A., Cartwright, J. A., Mertzman, K. R., Peng, Z. X., 2013, Composition and petrology of HED polymict breccias: The regolith of (4) Vesta. Meteoritics & Planetary Science, 48, 2105-2134, http://dx.doi.org/10.1111/maps.12182. | |
| Cartwright, J. A., Ott, U., Mittlefehldt, D. W., Herrin, J. S., Herrmann, S., Mertzman, S. A., Mertzman, K. R., Peng, Z. X., Quinn, J. E., 2013, The quest for regolithic howardites. Part 1: Two trends uncovered using noble gases. Geochimica et Cosmochimica Acta, 105, 15-Mar-13, 395-421, ISSN 0016-7037, http://dx.doi.org/10.1016/j.gca.2012.11.047. | |
| 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. | |
| RELAB, , Reflectance Experiment Lab , catalogue of samples. | |