Sample Petrographic Description
Sample Number | QUE 97991 |
Newsletter | 23,2 |
Location | Queen Alexandra Range |
Field Number | 9663 |
Dimensions (cm) | 2.0 x 1.25 x 1.5 |
Weight (g) | 6.77 |
Original Classification | Diogenite |
Mineral Composition (%Fa & %Fs) | |
Ferrosilite (mol%): 25 | |
Weathering | |
B | |
Fracturing | |
B | |
Macroscopic Description - Kathleen McBride | |
The exterior of this achondrite has dull black fusion crust on 45% of its surface. The interior is a tan matrix with melted appearing clasts and some minor cracks. The meteorite is friable and coarse grained with rust scattered. Irregularly shaped inclusions are white and black. | |
Thin Section Description (,2) - Tim McCoy | |
The section shows a groundmass of coarse (up to 1.5 mm) comminuted pyroxene, with minor plagioclase and SiO2. Orthopyroxene has a composition of Fs25Wo1-4 and plagioclase is An78-85Or0-3. The Fe/Mn ratio of the pyroxene is ~30. The meteorite is a diogenite. |
Antarctic Meteorite Images for Sample QUE 97991 | ||||
Lab Photo(s) : | ||||
References for Sample QUE97991 | |
Welten, K.C., Hillegonds, D.J., Masarik, J., and Nishiizumi, K., 2007, Cosmogenic 41Ca in diogenites: Production rates, pre-atmospheric size and terrestrial ages, Nuclear Instruments and Methods in Physics Research B, 259, 653-662, doi: 10.1016/j.nimb.2007.01.204. |