Sample Petrographic Description
Sample Number | MIL 11099 |
Newsletter | 36,1 |
Location | Miller Range |
Field Number | 22588 |
Dimensions (cm) | 2.0 x 1.75 x 1.5 |
Weight (g) | 6.85 |
Original Classification | Diogenite |
Pairing | MIL 07003; MIL 07613; MIL 090105; MIL 090106; MIL 090107; MIL 090112; MIL 090159; MIL 090220; MIL 090221; MIL 090291; MIL 11099; MIL 11197; MIL 11198; MIL 11199; MIL 11201; MIL 11202; MIL 11204; MIL 11205; |
Mineral Composition (%Fa & %Fs) | |
Ferrosilite (mol%): 30-48 | |
Weathering | |
B | |
Fracturing | |
B | |
Macroscopic Description - Kathleen McBride, Cecilia Satterwhite | |
The exterior surfaces have black patches of fusion crust that are glassy in some areas. The interior matrices are crème/tan colored with crystalline faces. Some yellow oxidation is present. These diogenites have a medium to coarse grained texture. | |
Thin Section Description (,2) - Cari Corrigan, Andrew Beck | |
The sections show a groundmass of coarse (up to 1.5 mm) comminuted pyroxene, with minor plagioclase, euhedral chromites (30 microns). Pyroxene compositions are Fs30-48Wo1-4and plagioclase is An87-92Or1. The Fe/Mn ratio of the pyroxene is ~28-29. These meteorites exhibit numerous shock features (including pockets of glass). MIL 11197 is less fragmented and the overall grain size is slightly larger, including a large (~2x4 mm) chromite grain. These are brecciated diogenites. They are similar enough to suggest pairing with the MIL 090112 group of brecciated diogenites described in the Fall 2012 newsletter. | |
Notes | |
MIL 07003, MIL 07613 (4 – 090105, 090106, 090107), MIL 090159 (3 – 090220, 090221), MIL 090112 (7 – 090291, 11099, 11201, 11202, 11204, 11205), MIL 11197, MIL 11198, and MIL 11199. Combination of these three diogenite pairing groups as well as four previously unpaired masses to form a new large 18 member pairing group of diogenites MIL 07003; based on terrestrial ages, compositions, find locations, and petrographic textures. Pairing updated in AMN 47,1. |
Antarctic Meteorite Images for Sample MIL 11099 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample MIL 11099 | ||||
Thin Section Photo(s) : | ||||