Sample Petrographic Description
Sample Number | MIL 090687 |
Newsletter | 35,2 |
Location | Miller Range |
Field Number | 20293 |
Dimensions (cm) | 1.0 x 1.0 x 0.5 |
Weight (g) | 0.77 |
Original Classification | Eucrite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 87-89;Ferrosilite (mol%): 37-45 | |
Weathering | |
B | |
Fracturing | |
B | |
Macroscopic Description - Kathleen McBride | |
The exterior is brown/black with some oxidation haloes. | |
Thin Section Description - Cari Corrigan, Andrew Beck, Nicole Lunning | |
This meteorite is dominated by coarse-grained (~500 micron average grain size) lathes of feldspar, some of which are fractured and recrystallized. Olivine grains, not common in eucrites, are found in this meteorite. Both olivine and pyroxene grains are much smaller (~50 microns). Mineral compositions are homogeneous with pyroxenes of Fs38-45Wo37-42), olivine (Fa87-89), and plagioclase (An90Or0.2). The Fe/Mn ratio of the pyroxene is ~30. The meteorite is a eucrite. |
Antarctic Meteorite Images for Sample MIL 090687 | ||||
Thin Section Photo(s) : | ||||