Sample Petrographic Description
Sample Number | PCA 02014 |
Newsletter | 27,1 |
Location | Pecora Escarpment |
Field Number | 13693 |
Dimensions (cm) | 3.5 x 2.5 x 1.5 |
Weight (g) | 21.24 |
Original Classification | Howardite |
Pairing | PCA 02009; PCA 02013; PCA 02014; PCA 02015; PCA 02016; PCA 02018; PCA 02019; PCA 02065; PCA 02066; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 24;Ferrosilite (mol%): 23-57 | |
Weathering | |
B | |
Fracturing | |
B | |
Macroscopic Description - Kathleen McBride | |
Fusion crust ranges from black to brown and is shiny and glassy with oxidation haloes. The interiors of these howardites are a gray to black matrix with some oxidation and multicolored inclusions. | |
Thin Section Description (,2) - Tim McCoy, Linda Welzenbach | |
These sections are similar enough that a single description will suffice. Each show a groundmass of comminuted pyroxene (up to 2 mm) and plagioclase with fine- to coarse-grained basaltic, impact-melt and diogentitic clasts ranging up to 3 mm. Minerals include abundant orthopyroxene with compositions ranging from Fs17-60Wo2-8 (Fe/Mn ~29), augite of Fs~40, plagioclase (An90-95) and SiO2. These meteorites are howardites. They are almost certainly paired with each other and with PCA 02016. |
Antarctic Meteorite Images for Sample PCA 02014 | ||||
Lab Photo(s) : | ||||
References for Sample PCA02014 | |
Singerling, S. A., Mcsween, H. Y., Taylor, L. A., 2013, Glasses in howardites: Impact melts or pyroclasts?. Meteoritics & Planetary Science, 48, 715-729, http://dx.doi.org/10.1111/maps.12099. | |
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. | |
RELAB, , Reflectance Experiment Lab , catalogue of samples. |