Sample Petrographic Description
Sample Number | MIL 090963 |
Newsletter | 35,1 |
Location | Miller Range |
Field Number | 20191 |
Dimensions (cm) | 1.25 x 1.5 x 1.0 |
Weight (g) | 2.51 |
Original Classification | Achon. Ungrouped |
Pairing | MIL 090405; MIL 090206; MIL 090340; MIL 090356; MIL 090805; MIL 090963; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 28-30;Ferrosilite (mol%): 10-11 | |
Weathering | |
C | |
Fracturing | |
B | |
Macroscopic Description - Kathleen McBride | |
About 50% of the exterior is covered with rusty brown fusion crust with fractures. The interior is fine grained with a crystalline texture and is rusty black in color. This meteorite is hard and brittle. | |
Thin Section Description (,2) - Cari Corrigan, Tim McCoy, Linda Welzenbach | |
This section consists of an aggregate of equigranular (up to 1 mm) olivine grains. Individual olivine grains are rimmed by dark material containing finely dispersed grains of metal, sulfide, and chromite. Olivine has compositions of Fa28-32. Clinopyroxene analyses are Fs11Wo43. This meteorite looks texturally like a ureilite, but given the recent abstract by Warren and Rubin (2012, LPSC 43, #2528) about MIL 090340 (which was originally classified as a ferroan ureilite but has detailed mineral compositions that are distinct from ureilites), we will classify it as an ungrouped achondrite. Further studies are warranted to examine pairing relationship with MIL 090340. |
Antarctic Meteorite Images for Sample MIL 090963 | ||||
Thin Section Photo(s) : | ||||