Sample Petrographic Description
Sample Number | LAR 12010 |
Newsletter | 36,2 |
Location | Larkman Nunatak |
Field Number | 23955 |
Dimensions (cm) | 7.5 x 5.0 x 5.0 |
Weight (g) | 409.63 |
Original Classification | Diogenite |
Mineral Composition (%Fa & %Fs) | |
Ferrosilite (mol%): 25 | |
Weathering | |
B/C | |
Fracturing | |
A/B | |
Macroscopic Description - Kathleen McBride | |
50% of the exterior is a patchy, dark brown fusion crust exhibiting polygonal fractures. The matrix is yellow in color and has visible olivine crystals. | |
Thin Section Description (,2) - Cari Corrigan, Linda Welzenbach | |
This heavily weathered section shows a groundmass of coarse (generally 200 microns, with larger clasts up to 2 mm) comminuted pyroxene, with minor plagioclase and SiO2. Orthopyroxene has a composition of Fs25Wo2-3 and plagioclase is An87-90Or0-3. The Fe/Mn ratio of the pyroxene is ~28-32. The meteorite is a brecciated diogenite. |
Antarctic Meteorite Images for Sample LAR 12010 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample LAR 12010 | ||||
Thin Section Photo(s) : | ||||