Sample Petrographic Description
Sample Number | QUE 99158 |
Newsletter | 24,2 |
Location | Queen Alexandra Range |
Field Number | 11641 |
Dimensions (cm) | 4.0 x 2.5 x 2.0 |
Weight (g) | 31.01 |
Original Classification | Enstatite Meteorite Ungr |
Pairing | QUE 94204; QUE 97289; QUE 97348; QUE 99059; QUE 99122; QUE 99157; QUE 99158; QUE 99387; |
Mineral Composition (%Fa & %Fs) | |
Ferrosilite (mol%): 0-1 | |
Weathering | |
C | |
Fracturing | |
C | |
Macroscopic Description - Kathleen McBride | |
10% of the exterior of these meteorites are covered with patchy brown-black fusion crust. The interiors reveal rusty crystalline material that crumbles easily. These meteorites are too rusty to observe any visible inclusions. | |
Thin Section Description (,2) - Tim McCoy, Linda Welzenbach | |
These meteorites are so similar that a single description suffices. The section consists of mm-sized enstatite grains (Fs0-1), SiO2, zoned plagioclase (An7-31), potassium feldspar, metal, troilite, daubreelite, alabandite and schreibersite. The latter phases often occur as rounded enclaves in the enstatite. These meteorites are paired with the QUE 99059/94204/97348/97289 grouping. Unlike these earlier members, which contained either plagioclase or SiO2, these three contain both phases. These meteorites are unusual aubrites or enstatite chondrite impact melt rocks. |
Antarctic Meteorite Images for Sample QUE 99158 | ||||
Thin Section Photo(s) : | ||||
References for Sample QUE99158 | |
Van Niekerk, D., Keil, K., Humayun, M., 2014, Petrogenesis of anomalous Queen Alexandra Range enstatite meteorites and their relation to enstatite chondrites, primitive enstatite achondrites, and aubrites. Meteoritics & Planetary Science, 49, 295-312. | |
Rochette, P., Kohout, T., Pesonen, L., Quirico, E., Sagnotti, L., Skripnik, A., Gattacceca, J., Bonal, L., Bourot-Denise, M., Chevrier, V., Clerc, J. P., Consolmagno, G., Folco, L., Gounelle, M., 2008, Magnetic classification of stony meteorites: 2. Non-ordinary chondrites. Meteoritics & Planetary Science, 43, 959-980, http://dx.doi.org/10.1111/j.1945-5100.2008.tb01092.x. |