Sample Petrographic Description
| Sample Number | LAR 06252 |
| Newsletter | 32,2 |
| Location | Larkman Nunatak |
| Field Number | 19010 |
| Dimensions (cm) | 13.0 x 11.5 x 8.0 |
| Weight (g) | 2660.10 |
| Original Classification | EH3 Chondrite |
| Mineral Composition (%Fa & %Fs) | |
| Fayalite (mol%): 1;Ferrosilite (mol%): 1-4 | |
| Weathering | |
| Be | |
| Fracturing | |
| A/B | |
| Macroscopic Description - Cecilia Satterwhite | |
| The exterior has a brown/black fusion crust with fractures penetrating the surface. Evaporites, chondrules/inclusions and rust are visible on the surface. The interior is a dark gray to black with abundant white inclusions. Some weathered areas are a brownish gray in color. | |
| Thin Section Description (,2) - Cari Corrigan, Tim McCoy, Linda Welzenbach | |
| The section shows an aggregate of chondrules (up to 2 mm), chondrule fragments, and pyroxene grains in a matrix of about 30% metal and sulfide. Chondrules contain moderate to small abundances of olivine. Weathering is modest, with staining of some enstatite grains and minor alteration of metal and sulfides. Microprobe analyses show the olivine is Fa1 and pyroxene is Fs1-4. Metal contains ~2.5 wt% Si. The meteorite is an EH3 chondrite. | |
| Antarctic Meteorite Images for Sample LAR 06252 | ||||
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| Field photo image(s) courtesy of the ANSMET (ANtarctic Search for METeorites) Program, Case Western Reserve University and the University of Utah | ||||
| Antarctic Meteorite Images for Sample LAR 06252 | ||||
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| Antarctic Meteorite Images for Sample LAR 06252 | ||||
| Thin Section Photo(s) : | ||||
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| References for Sample LAR06252 | |
| Hellmann, J.L., Hopp, T., Burkhardt, C., Becker, H., Fischer-Godde, M., and Kleine, T., 2021, Tellurium isotope cosmochemistry: Implications for volatile fractionation in chondrite parent bodies and origin of the late veneer. , Geochimica et Cosmochimica Acta, 309 , 313–328 , https://doi.org/10.1016/j.gca.2021.06.038 . | |
| Simkus, D.N., Aponte, J.C., Elsila, J.E., McLain, H.L., Parker, E.T., Dworkin, J.P., and Glavin, D.P., 2021, Low total abundances and a predominance of n-ω-amino acids in enstatite chondrites: Implications for thermal stability of amino acids in the inner solar system. , Meteoritics & Planetary Science, 56 , 2118-2127 , doi: 10.1111/maps.13757 . | |
| Sikdar, J., and Rai, V.K., 2021, Mg isotope variations in microphases of unequilibrated enstatite chondrites. , Meteoritics & Planetary Science, 56 , 1459–1477 , doi: 10.1111/maps.13722 . | |
| Zhao, C., Lodders, K., Bloom, H., Chen, H., Tian, Z., Koefoed, P., Petö, M.K., and Wang, K., 2020, Potassium isotopic compositions of enstatite meteorites. , Meteoritics & Planetary Science, 55 , 1404–1417 , doi: 10.1111/maps.13358. | |
| Lehner, S. W., McDonough, W. F., Nemeth, P., 2014, EH3 matrix mineralogy with major and trace element composition compared to chondrules. , Meteoritics & Planetary Science, 49 , 2219-2240 . | |
| RELAB, , Reflectance Experiment Lab , catalogue of samples, . | |