Sample Petrographic Description
Sample Number | LAR 06875 |
Newsletter | 30,2 |
Location | Larkman Nunatak |
Field Number | 19328 |
Dimensions (cm) | 6.0 x 5.5 x 3.0 |
Weight (g) | 165.80 |
Original Classification | Eucrite (Brecciated) |
Mineral Composition (%Fa & %Fs) | |
Ferrosilite (mol%): 61 | |
Weathering | |
B/C | |
Fracturing | |
B/C | |
Macroscopic Description - Kathleen McBride | |
Black and dark gray patches of various sizes of what appears to be fusion crust is present on the exterior. The dull, marbled appearing interior consists of cream and dark gray materials. Individual clasts are not distinct. Fines are rather powdery and weathered. | |
Thin Section Description - Tim McCoy, Lauren LaCroix, Linda Welzenbach | |
This meteorite is dominated by fine-grained (~100 micron average grain size) basaltic material which occurs as both the host and clasts within this meteorite. In parts, the section has a catalcastic, rather than brecciated, appearance. Occasional coarser-grained clasts (grain sizes up to 0.2 mm) are observed. Mineral compositions are homogeneous with orthopyroxene (Fs61Wo2), augite (Fs27Wo43), and plagioclase (An86Or0.5). The Fe/Mn ratio of the pyroxene is ~30. The meteorite is a brecciated eucrite. |
Antarctic Meteorite Images for Sample LAR 06875 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample LAR 06875 | ||||
Thin Section Photo(s) : | ||||
References for Sample LAR06875 | |
Mittlefehldt, D.W., Greenwood, R.C., Berger, E.L., Le, L., Peng, Z.X., and Ross, D.K., 2022, Eucrite-type achondrites: Petrology and oxygen isotope compositions, Meteoritics & Planetary Science, 57, 484-526, doi:10.1111/maps.13730. | |
Schiller, M., Dallas, J.A., Creech, J., Bizzarro, M., Baker, J.A., 2017, Tracking the formation of magma oceans in the Solar System using stable magnesium isotopes. Geochem. Persp. Let., 3, 22-31. |