Sample Petrographic Description
Sample Number | GRO 95626 |
Newsletter | 21,1 |
Location | Grosvenor Mountains |
Field Number | 10939 |
Dimensions (cm) | 5.5 x 3.0 x 2.0 |
Weight (g) | 52.20 |
Original Classification | EL6 Chondrite |
Mineral Composition (%Fa & %Fs) | |
Ferrosilite (mol%): 0.1-0.5 | |
Weathering | |
B/Ce | |
Fracturing | |
B/C | |
Macroscopic Description - Carol Schwarz | |
This chondrite has thin, remnant, iridescent fusion crust on about 50% of the exterior surface. The interior is dark red brown and contains some evaporate deposits. The specimen is very co-herent because of its high metal content. Several deep fractures pene-trate this meteorite. There are no clasts or chondrules visible on the interior. | |
Thin Section Description (,2) - Brian Mason | |
Only vague traces of chondritic structure are visible in the thin section, which shows the meteorite to consist largely of prismatic or granular enstatite (grain size 0.1-0.2 mm), a considerable amount of nickel-iron, and minor amounts of sulfides and plagioclase. The meteorite is considerably weathered, with brown limonitic staining throughout the section. Microprobe analyses show that the enstatite is almost pure MgSiO3 (FeO 0.2-0.5%); one grain of plagioclase, An17, was analyzed; the nickel-iron contains 0.9-1.0% Si. The meteorite is an EL6 chondrite. |
Antarctic Meteorite Images for Sample GRO 95626 | ||||
Thin Section Photo(s) : | ||||
References for Sample GRO95626 | |
Johnston, S., Brandon, A., McLeod, C., Rankenburg, K., Becker, H., and Copeland, P., 2022, Nd isotope variation between the Earth-Moon system and enstatite chondrites, Nature, 611, doi: 10.1038/s41586-022-05265-0. | |
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. | |
Schultz, L., Franke, L., 2004, Helium, neon, and argon in meteorites: A data collection. Meteoritics & Planetary Science, 39, 1889-1890, http://dx.doi.org/10.1111/j.1945-5100.2004.tb00083.x. | |
Patzer, A., Schultz, L., 2002, Noble gases in enstatite chondrites II: The trapped component. Meteoritics & Planetary Science, 37, 601-612. | |
Patzer, A., Schultz, L., 2001, Noble gases in enstatite chondrites I: Exposure ages, pairing, and weathering effects. Meteoritics & Planetary Science, 36, 947-961, http://dx.doi.org/10.1111/j.1945-5100. |