Sample Petrographic Description
Sample Number | MIL 11204 |
Newsletter | 35,2 |
Location | Miller Range |
Field Number | 21578 |
Dimensions (cm) | 3.5 x 2.5 x 1.4 |
Weight (g) | 16.24 |
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%): 13-35 | |
Weathering | |
Be | |
Fracturing | |
A/B | |
Macroscopic Description - Kathleen McBride, Cecilia Satterwhite | |
The exteriors have brown/black fusion crust with polygonal fractures. The interiors of these diogenites have tan matrices with dark gray to black “marbled” areas; some have light and dark inclusions. Some exhibit minor oxidation and rust. | |
Thin Section Description (,2) - Cari Corrigan, Andrew Beck, Nicole Lunning | |
These meteorites are similar enough that one description suffices. The sections show a groundmass of coarse (up to 1.5 mm) comminuted pyroxene, with minor plagioclase and chromites. MIL 11202 contains a large (1.5 mm) chromite grain, and MIL 11204 contains a large (2.0 mm) plagioclase grain. Pyroxene compositions are Fs11-35Wo4-44 and plagioclase is An78-87Or0-1. The Fe/Mn ratio of the pyroxene is ~29. The meteorites exhibit numerous shock features and are brecciated diogenites. | |
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 11204 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample MIL 11204 | ||||
Thin Section Photo(s) : | ||||