Sample Petrographic Description
Sample Number | GRA 12512 |
Newsletter | 36,2 |
Location | Graves Nunataks |
Field Number | 24351 |
Dimensions (cm) | 2.9 x 2.5 x 2.3 |
Weight (g) | 21.60 |
Original Classification | CO3 Chondrite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 1-74;Ferrosilite (mol%): 1 | |
Weathering | |
A/B | |
Fracturing | |
B | |
Macroscopic Description - Cecilia Satterwhite | |
The exterior is covered with fractured, brown/black fusion crust. Exposed areas are pitted and weathered a rusty brown color. The interior is a dark gray to black matrix with abundant inclusions of various sizes; most are white or rusty in color. Some oxidation and rusty areas are visible. | |
Thin Section Description (,2) - Cari Corrigan, Linda Welzenbach | |
The section consists of abundant small (up to 1 mm) chondrules, chondrule fragments and has mineral grains in a dark matrix. Metal and sulfide occur within and rimming the chondrules. Olivine ranges in composition from Fa1-74, with a continuous range of intermediate compositions and a slight peak at Fa1-5. One pyroxene analysis is Fs1Wo3. The matrix appears to consist largely of Fe-rich olivine. The meteorite is a CO3 chondrite. |
Antarctic Meteorite Images for Sample GRA 12512 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample GRA 12512 | ||||
Thin Section Photo(s) : | ||||
References for Sample GRA12512 | |
Rubin, A.E. , and Li, Y., 2019, Formation and destruction of magnetite in CO3 chondrites and other chondrite groups. Geochemistry, 79, 125528, https://doi.org/10.1016/j.chemer.2019.07.009. |