Sample Petrographic Description
Sample Number | MET 01087 |
Newsletter | 26,1 |
Location | Meteorite Hills |
Field Number | 13298 |
Dimensions (cm) | 5.5 x 3.5 x 1.5 |
Weight (g) | 28.41 |
Original Classification | Howardite |
Pairing | MET 96500; MET 00800; MET 01082; MET 01087; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 26;Ferrosilite (mol%): 19-52 | |
Weathering | |
B | |
Fracturing | |
B/C | |
Macroscopic Description - Kathleen McBride | |
The exterior of these achondrites has very small patches of black fusion crust. Areas without fusion crust expose an interior that is gray-green in color with yellow-rust colored patches and haloes. The interiors are fine-grained, yellow ochre in color with rust stained, white or gray inclusions and chondrules/chondrule-like spheres. 082 has areas that are black in color. | |
Thin Section Description (,2) - Tim McCoy | |
These meteorites are very similar and tentatively paired. The sections show a groundmass of comminuted pyroxene and plagioclase (up to 0.5 mm) with basaltic and orthopyroxenite clasts ranging up to a few mm. Pyroxene includes orthopyroxene of Fs21Wo2 and finely-exsolved (1-3 µm) orthopyroxene/augite intergrowths of Fs57Wo2 and Fs24Wo40, respectively. A single olivine grain in MET 01087 is Fa26; plagioclase is An85-90Or0.5 and a single SiO2 grain was analyzed. The meteorites are howardites and, on the basis of similarity in find site with MET 01082 and 01087 and petrographic features, may be paired with MET 96500. |
Antarctic Meteorite Images for Sample MET 01087 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample MET 01087 | ||||
Thin Section Photo(s) : | ||||
References for Sample MET01087 | |
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. | |
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. |