Sample Petrographic Description
| Sample Number | PCA 02017 |
| Newsletter | 27,1 |
| Location | Pecora Escarpment |
| Field Number | 13650 |
| Dimensions (cm) | 2.0 x 1.5 x 0.5 |
| Weight (g) | 2.35 |
| Original Classification | Diogenite |
| Pairing | PCA 02008; PCA 02017 |
| Mineral Composition (%Fa & %Fs) | |
| Fayalite (mol%): 26-29;Ferrosilite (mol%): 17-25 | |
| Weathering | |
| A/B | |
| Fracturing | |
| A/B | |
| Macroscopic Description - Kathleen McBride | |
| The exteriors of these diogenites have smooth, shiny black fusion crust. The interiors are fine-grained, medium gray matrix with light gray and cream colored inclusions. | |
| Thin Section Description (,2) - Tim McCoy, Linda Welzenbach | |
| These sections show a groundmass of coarse (up to 2 mm) comminuted pyroxene with minor SiO2, olivine (Fa25-29) and plagioclase (An90). Orthopyroxene has a composition of Fs17-26Wo2-3 and an Fe/Mn ratio of ~28-30. The meteorites are diogenites and are probably paired. | |
| Antarctic Meteorite Images for Sample PCA 02017 | ||||
| Field Photo(s) : | ||||
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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 PCA 02017 | ||||
| Lab Photo(s) : | ||||
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| References for Sample PCA02017 | |
| Hahn, T.M., Lunning, N.G., McSween, H.Y., Bodnar, R.J., and Taylor, L.A., 2017, Mg-rich harzburgites from Vesta: Mantle residua or cumulates from planetary differentiation. , Meteoritics & Planetary Science, 53 , 514-546 , doi: 10.111/maps.13036. | |
| 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 . | |
| Beck, A. W., Welten, K. C., McSween Jr., H. Y., Viviano, C. E., Caffee, M. W., 2012, Petrologic and textural diversity among the PCA 02 howardite group, one of the largest pieces of the Vestan surface. , Meteoritics & Planetary Science, 47 , 947-969 . | |
| Shearer, C. K., Burger, P., Papike, J. J., 2010, Petrogenetic relationships between diogenites and olivine diogenites: Implications for magmatism on the HED parent body. , Geochimica et Cosmochimica Acta, 74 Issue 16 , 15-Aug-10 , 4865-4880 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2010.05.015 . | |