Sample Petrographic Description
Sample Number | GRA 95208 |
Newsletter | 20,1 |
Location | Graves Nunataks |
Field Number | 7651 |
Dimensions (cm) | 8.0 x 6.0 x 5.0 |
Weight (g) | 778.30 |
Original Classification | H3.7 Chondrite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 19-27;Ferrosilite (mol%): 7-23 | |
Weathering | |
B | |
Fracturing | |
A/B | |
Macroscopic Description - Kathleen McBride | |
The exterior of this meteorite is covered by dull, thin, black fusion crust. Chondrules are visible through the fusion crust which covers 90% of this meteorite. The interior is a dark gray matrix with some light gray patches visible. This meteorite is loaded with chondrules, several mm in diameter, the largest seen is 7 mm. The meteorite has a high metal content and has rusty patches with metal veins. This ordinary chondrite was very heavy and difficult to break. | |
Thin Section Description (,2) - Brian Mason | |
The section shows a close-packed aggregate of chondrules (up to 1.8 mm across), chondrule fragments, and mineral grains in a dark matrix containing a moderate amount of nickel-iron and troilite. The meteorite is considerably weathered, with limonitic staining throughout the section. Microprobe analyses show olivine and pyroxene of variable composition: olivine, Fa19-27, mean Fa21; pyroxene, Fs7-23. The meteorite is classified as an H3 chondrite (estimated H3.7). |
Antarctic Meteorite Images for Sample GRA 95208 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample GRA 95208 | ||||
Thin Section Photo(s) : | ||||
References for Sample GRA95208 | |
Bonal, L., Quirico, E., Flandinet, L., Montagnac, G., 2016, Thermal history of type 3 chondrites from the Antarctic meteorite collection determined by Raman spectroscopy of their polyaromatic carbonaceous matter. Geochimica et Cosmochimica Acta, 189, 312-337. | |
Vernazza, P., and M. Lockhart , B. Zanda, R. P. Binzel, T. Hiroi, F. E. DeMeo, M. Birlan, R. Hewins, L. Ricci, P. Barge, 2014, Multiple and fast: The accretion of ordinary chondrite parent bodies. . The Astrophysical Journal , 791, 120-131, https://doi.org/10.1088/0004-637X/791/2/120. | |
Wang, M. S., Lipschutz, M. E., 2007, Trace elements in primitive meteorites-VII Antarctic unequilibrated ordinary chondrites. Geochimica et Cosmochimica Acta, 71 Issue 4, 15-Feb-07, 1062-1073, ISSN 0016-7037, http://dx.doi.org/10.1016/j.gca.2006.10.009. | |
Menzies, O. N., Bland, P. A., Berry, F. J., Cressey, G., 2005, A M”ssbauer spectroscopy and X-ray diffraction study of ordinary chondrites: Quantification of modal mineralogy and implications for redox conditions during metamorphism. Meteoritics & Planetary Science, 40, 1023-1042, http://dx.doi.org/10.1111/j.1945-5100.2005.tb00171.x. | |
RELAB, , Reflectance Experiment Lab , catalogue of samples. |