Sample Petrographic Description
Sample Number | LAR 12059 |
Newsletter | 38,1 |
Location | Larkman Nunatak |
Field Number | 23982 |
Dimensions (cm) | 5.0 x 3.0 x 2.7 |
Weight (g) | 171.33 |
Original Classification | Iron-IAB |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 5;Ferrosilite (mol%): 2-6 | |
Macroscopic Description - Cari Corrigan, Tim McCoy | |
The main mass of this meteorite has two distinct sides, one that is highly irregular and knobby, and one that is smooth and rounded. On one edge of the smooth surface is an area of pronounced iridescence. The entire meteorite is a rusty brown color with frequent to abundant rust haloes. | |
Thin Section Description (,2) - Cari Corrigan, Tim McCoy | |
The meteorite exhibits a medium octahedral pattern with kamacite lamellae of 1.5-1.8 mm width, with interstitial ribbons of taenite, comb plessite and schreibersite. Rare fusion crust is observed but α2 structure extends ~2 mm into the interior over parts of the section. Inclusions of olivine, pyroxene, plagioclase, troilite and graphite are present. The average composition based on a microprobe traverse of 100 points is 7.6 wt% Ni, 0.12 wt% P. Olivine compositions are Fa5, pyroxenes are bimodal, Fs3Wo45 and Fs6Wo1, and feldspars are An9-17Or4-6. The meteorite is likely a silicate-bearing IAB iron. |
Antarctic Meteorite Images for Sample LAR 12059 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample LAR 12059 | ||||
Thin Section Photo(s) : | ||||