Sample Petrographic Description
Sample Number | LAR 12139 |
Newsletter | 36,2 |
Location | Larkman Nunatak |
Field Number | 23150 |
Dimensions (cm) | 2.5 x 2.5 x 1.5 |
Weight (g) | 11.46 |
Original Classification | Howardite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 42;Ferrosilite (mol%): 18-61 | |
Weathering | |
B | |
Fracturing | |
B | |
Macroscopic Description - Kathleen McBride | |
Smooth brown/black fusion crust covers 50% of the exterior surface. The fine grained interior is tan to gray in color with black and white inclusions. | |
Thin Section Description (,2) - Cari Corrigan, Linda Welzenbach | |
The section shows a groundmass of comminuted pyroxene and plagioclase (up to 0.5 mm) with fine- to coarse-grained basaltic clasts ranging up to 5 mm. One large diogenitic clast (~1 cm) takes up much of the section. Most of the pyroxene is orthopyroxene with compositions ranging from Fs24-61Wo1-4 (most Fs24-30), a single augite of Fs18Wo42 and an olivine of Fa42. Fe/Mn is 27-32. The meteorite is a howardite. |
Antarctic Meteorite Images for Sample LAR 12139 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample LAR 12139 | ||||
Thin Section Photo(s) : | ||||