Sample Petrographic Description
Sample Number | LAR 12090 |
Newsletter | 39,1 |
Location | Larkman Nunatak |
Field Number | 22612 |
Dimensions (cm) | 7.0 x 6.5 x 3.0 |
Weight (g) | 251.89 |
Original Classification | L3.8 Chondrite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 20-31 | |
Weathering | |
B/Ce | |
Fracturing | |
A/B | |
Macroscopic Description - Cecilia Satterwhite | |
Black/brown fusion crust is present on 75% of the meteorite’s exterior. Oxidation haloes and rusty areas are visible with some evaporites. The interior is a dark gray to black matrix with large gray inclusions/chondrules are visible. Oxidation is heavy in some areas with rust; most inclusion/chondrules are weathered. | |
Thin Section Description (,2) - Cari Corrigan, Tim McCoy | |
The section exhibits numerous large, well-defined chondrules (up to 1.5 mm) in a dark matrix of fine-grained silicates, metal and troilite. Weak shock effects are present. Polysynthetically twinned pyroxene is present. The meteorite is extensively weathered and stained. Silicates are unequilibrated; olivines range from Fa20-31 and pyroxene is Fs1Wo1. The meteorite is an L3 chondrite (estimated subtype 3.8). |
Antarctic Meteorite Images for Sample LAR 12090 | ||||
Lab Photo(s) : | ||||
References for Sample LAR12090 | |
RELAB, , Reflectance Experiment Lab , catalogue of samples. |