Sample Petrographic Description
Sample Number | MET 96500 |
Newsletter | 21,1 |
Location | Meteorite Hills |
Field Number | 9526 |
Dimensions (cm) | 11.0 x 8.0 x 6.0 |
Weight (g) | 592.90 |
Original Classification | Howardite |
Pairing | MET 96500; MET 00800; MET 01082; MET 01087; |
Mineral Composition (%Fa & %Fs) | |
Ferrosilite (mol%): 20-30 | |
Weathering | |
B | |
Fracturing | |
B | |
Macroscopic Description - Kathleen McBride | |
The dull fusion crust on this achondrite is dark brown and thin and covers approximately 25% of the exterior. The exposed interior has weathered to a cement gray-yellow-orange color. It is pitted and friable. The fresh interior surface is off white to yellow and fine grained, with a sugary/crystalline texture. There are numerous inclusions of various sizes - rounded/subrounded to angular clasts and grains. Some metal and rusting is visible. | |
Thin Section Description (,6) - Brian Mason | |
The section shows a groundmass of comminuted pyroxene and plagioclase (grains up to 0.2 mm) with a few larger plagioclase clasts (up to 2 mm). Microprobe analyses show that most of the pyroxene is hypersthene (Wo1-4, Fs20-30); one grain of augite, Wo41Fs20, was analyzed, and several grains of intermediate composition. Plagioclase composition is An89-92. One grain of a SiO2 polymorph was analyzed. The meteorite is classified as a howardite. |
Antarctic Meteorite Images for Sample MET 96500 | ||||
Lab Photo(s) : | ||||
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Antarctic Meteorite Images for Sample MET 96500 | ||||
Thin Section Photo(s) : | ||||
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References for Sample MET96500 | |
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. | |
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. |