Sample Petrographic Description
Sample Number | LAR 12247 |
Newsletter | 39,2 |
Location | Larkman Nunatak |
Field Number | 23961 |
Dimensions (cm) | 7.0 x 6.0 x 2.0 |
Weight (g) | 137.40 |
Original Classification | CR2 Chondrite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 0-30;Ferrosilite (mol%): 11-17 | |
Weathering | |
A/Be | |
Fracturing | |
A | |
Macroscopic Description - Rachel Funk, Cecilia Satterwhite | |
The exterior has brown fusion crust over 95% of its surface. Minor orange rust and evaporites are present. Dark brown/black matrix with 1-2 mm sized gray chondrules. Orange rust is present and shiny metal is visible throughout. | |
Thin Section Description (,2) - Cari Corrigan, Tim McCoy | |
The extensively weathered thin section exhibits well-defined, metal-rich chondrules and CAI’s in a dark matrix of FeO-rich phyllosilicate. Polysynthetically twinned pyroxene is abundant. Silicates are unequilibrated; olivines range from Fa0-30 and pyroxenes from Fs11-17Wo0-3. The meteorite is probably a CR2 chondrite. |
Antarctic Meteorite Images for Sample LAR 12247 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample LAR 12247 | ||||
Thin Section Photo(s) : | ||||
References for Sample LAR12247 | |
Hiroi, T., Ohtsuka, K., Howard, K.T., Robertson, K.R., and Milliken, R.E., Kaiden, H., Imae, N., Misawa, K., Kojima, H., Sasakia, S., Matsuokaa, M., Nakamura, T., Bish, D.L., 2021, UV-visible-infrared spectral survey of Antarctic carbonaceous chondrite chips. Polar Science, 29, 100723, https://doi.org/10.1016/j.polar.2021.100723. | |
RELAB, , Reflectance Experiment Lab , catalogue of samples. |