Sample Petrographic Description
Sample Number | MIL 090105 |
Newsletter | 33,2 |
Location | Miller Range |
Field Number | 20371 |
Dimensions (cm) | 4.9 x 4.8 x 3.5 |
Weight (g) | 119.42 |
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) | |
Fayalite (mol%): 29-34;Ferrosilite (mol%): 14 | |
Weathering | |
A/B | |
Fracturing | |
A | |
Macroscopic Description - Cecilia Satterwhite | |
The exterior has 70% black fusion crust with some oxidation present. Areas without fusion crust reveal a tan matrix with some evaporites. The interior is a cream colored to tan matrix with some dark and light inclusions/clasts. A few larger yellowish clasts are visible. | |
Thin Section Description (,2) - Cari Corrigan, Tim McCoy, Linda Welzenbach | |
The sections show coarse (up to 5 mm) comminuted pyroxene with minor interstitial plagioclase and SiO2. Pyroxenes exhibit blebby exsolution, with low-Ca pyroxene hosts of compositions Fs29-53Wo1-11 and high-Ca pyroxene exsolution of composition Fs14Wo40. Fe/Mn ratios of the pyroxenes are ~30. Feldspars are An82-91Or0.2-0.5. These meteorites are diogenites, although the pyroxene is on the FeO-rich end of diogenites towards cumulate eucrites. These are likely paired with MIL 07613. | |
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 090105 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample MIL 090105 | ||||
Thin Section Photo(s) : | ||||