Sample Petrographic Description
Sample Number | MIL 090288 |
Newsletter | 35,2 |
Location | Miller Range |
Field Number | 20602 |
Dimensions (cm) | 4.0 x 2.0 x 1.5 |
Weight (g) | 17.38 |
Original Classification | CM1/2 Chondrite |
Pairing | MIL 090288; MIL 090986; MIL 090992; MIL 090993; MIL 11111; |
Weathering | |
Be | |
Fracturing | |
B/C | |
Macroscopic Description - Kathleen McBride | |
The exteriors are covered with a purplish black fusion crust with polygonal fractures and some evaporites. The exposed interior is black. The interiors are a black matrix with evaporites along fractures. | |
Thin Section Description (,2) - Cari Corrigan, Tim McCoy, Nicole Lunning | |
These sections are similar enough that one description is sufficient. The sections consist of a few small chondrules (up to 0.5 mm), mineral grains and CAIs set in a black matrix; rare metal and sulfide grains are present. Olivine compositions are Fa0-2, no pyroxene grains were analyzed. Aqueous alteration of the matrix is substantial. These meteorites are CM1-2 chondrites, possibly paired with the MIL 090986 series reported in the Spring 2012 newsletter. |
Antarctic Meteorite Images for Sample MIL 090288 | ||||
Thin Section Photo(s) : | ||||
References for Sample MIL090288 | |
Sridhar, S., Bryson, J. F, King, A. J., & Harrison, R. J., 2021, Constraints on the ice composition of carbonaceous chondrites from their magnetic mineralogy. Earth and Planetary Science Letters, 576, 117243. | |
Bates, H.C., King, A.J., Donaldson Hanna, K.L., Bowles, N.E., Russell, SS., 2020, Linking mineralogy and spectroscopy of highly aqueously altered CM and CI carbonaceous chondrites in preparation for primitive asteroid sample return. Meteoritics & Planetary Science, 55, 77–101, doi: 10.1111/maps.13411. | |
King, A. J., Schofield, P. F., & Russell, S. S. , 2017, Type 1 aqueous alteration in CM carbonaceous chondrites: Implications for the evolution of water?rich asteroids. . Meteoritics & Planetary Science, 52, 1197-1215, doi: 10.1111/maps.12872. |