Sample Petrographic Description
Sample Number | LAR 06512 |
Newsletter | 32,2 |
Location | Larkman Nunatak |
Field Number | 19283 |
Dimensions (cm) | 2.5 x 3.0 x 2.25 |
Weight (g) | 29.01 |
Original Classification | Mesosiderite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 31;Ferrosilite (mol%): 22-5 | |
Weathering | |
A/B | |
Fracturing | |
A/B | |
Macroscopic Description - Kathleen McBride | |
Some brown/black fusion crust is on the exterior. The interior is a light gray matrix with a little metal and minor rust. Inclusions are dark gray to white in color. | |
Thin Section Description (,2) - Cari Corrigan, Tim McCoy, Linda Welzenbach | |
This section consists of angular and basaltic fragments and individual grains of pyroxene, plagioclase, rare olivine, metal and sulfide set in a clastic matrix. Individual grains range up to 6 mm in size. Particularly prominent are sulfide-rich clasts that appear to have impact-melted textures. Pyroxene is exsolved, with compositions of Fs22-58 Wo1-43 and has Fe/Mn ratios of ~30. Olivine is Fa31. Plagioclase is An92Or1. The somewhat higher than normal abundance of metal and sulfide suggest that this could be a separated silicate clast from a mesosiderite. |
Antarctic Meteorite Images for Sample LAR 06512 | ||||
Thin Section Photo(s) : | ||||