Sample Petrographic Description
Sample Number | MAC 02666 |
Newsletter | 26,2 |
Location | MacAlpine Hills |
Field Number | 14149 |
Dimensions (cm) | 3.0 x 2.5 x 1.5 |
Weight (g) | 20.27 |
Original Classification | Howardite |
Mineral Composition (%Fa & %Fs) | |
Ferrosilite (mol%): 23-55 | |
Weathering | |
B | |
Fracturing | |
B | |
Macroscopic Description - Kathleen McBride | |
A brown/black fusion crust covers over 50% of the exterior. Exposed interior is gray with white clasts. Some areas show plucking. The gray matrix has white to tan clasts. Some have black rims. A few angular black clasts are visible. | |
Thin Section Description (,4) - Tim McCoy, Linda Welzenbach | |
The section shows a groundmass of comminuted pyroxene (up to 1 mm) and plagioclase with fine- to coarse-grained basaltic clasts ranging up to 3 mm. It also contains clasts (up to 0.5 mm) of C1 carbonaceous chondrite material. Minerals include abundant orthopyroxene with compositions ranging from Fs23-55Wo2-4 (Fe/Mn ~30), a single augite of Fs30, plagioclase (An90-95) and SiO2. The meteorite is a howardite. |
Antarctic Meteorite Images for Sample MAC 02666 | ||||
Lab Photo(s) : | ||||
References for Sample MAC02666 | |
Visser, R., John, T., Patzek, M., Bischoff, A., & Whitehouse, M. J., 2019, Sulfur isotope study of sulfides in CI, CM, C2ung chondrites and volatile-rich clasts–Evidence for different generations and reservoirs of sulfide formation. Geochimica et Cosmochimica Acta, 261, 210-223. | |
Patzek, M., Bischoff, A., Visser, R., & John, T., 2018, Mineralogy of volatile-rich clasts in brecciated meteorites. Meteoritics & Planetary Science, 53, 2519-2540. | |
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. |