Sample Petrographic Description
Sample Number | GRA 12510 |
Newsletter | 38,2 |
Location | Graves Nunataks |
Field Number | 24379 |
Dimensions (cm) | 2.0 x 1.7 x 0.7 |
Weight (g) | 4.41 |
Original Classification | Winonaite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 1-3;Ferrosilite (mol%): 1-4 | |
Weathering | |
B | |
Fracturing | |
A/B | |
Macroscopic Description - Cecilia Satterwhite | |
80% of the exterior is covered with black/brown fusion crust that is rusty in some areas. The interior is rusty orange with metal and has a coarse grained texture. | |
Thin Section Description (,2) - Cari Corrigan, Tim McCoy | |
The section is composed of subequal amounts of iron-nickel metal with troilite and silicate grains, up to 0.5 mm. Metal grains include rare graphite and schreibersite. The silicates include olivine (Fa1-3), orthopyroxene (Fs1-4Wo1-2), clinopyroxene (Fs1-5Wo45-49) and feldspar. The combination of graphite-bearing metal and low-FeO mafics suggests this meteorite is a winonaite and closely related to the silicate-bearing IAB irons. |
Antarctic Meteorite Images for Sample GRA 12510 | ||||
Thin Section Photo(s) : | ||||