Sample Petrographic Description
Sample Number | GRA 98171 |
Newsletter | 23,1 |
Location | Graves Nunataks |
Field Number | 11952 |
Dimensions (cm) | 2.0 x 2.0 x 1.0 |
Weight (g) | 8.00 |
Original Classification | L3.8 Chondrite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 7-25;Ferrosilite (mol%): 4-20 | |
Weathering | |
Ce | |
Fracturing | |
C | |
Macroscopic Description - Kathleen McBride | |
Less then 5% of the exterior of this ordinary chondrite has some rough black fusion crust. The interior is rusty with evaporites visible. It has a high metal content. | |
Thin Section Description (,2) - Tim McCoy | |
The section exhibits numerous large, well-defined chondrules (up to 2 mm) in a black matrix of fine-grained silicates, metal and troilite. Weak shock effects are present. Polysynthetically twinned pyroxene is common. The meteorite is highly weathered. Silicates are unequilibrated; olivines range from Fa7-25, with most grains Fs22-24, and pyroxenes are Fs4-20. The meteorite if an L3 chondrite (estimated subtype 3.8). |
Antarctic Meteorite Images for Sample GRA 98171 | ||||
Thin Section Photo(s) : | ||||