Sample Petrographic Description
Sample Number | MAC 02453 |
Newsletter | 28,1 |
Location | MacAlpine Hills |
Field Number | 14227 |
Dimensions (cm) | 8.0 x 6.0 x 3.5 |
Weight (g) | 410.40 |
Original Classification | CK5 Chondrite |
Updated Classification | LL5 Chondrite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 32;Ferrosilite (mol%): 26 | |
Weathering | |
A | |
Fracturing | |
A | |
Macroscopic Description - Kathleen McBride | |
The exterior has a no fusion crust and has a greenish tint. The gray crystalline interior has large gray crystals and small black and white inclusions. This carbonaceous chondrite was very hard. | |
Thin Section Description (,2) - Cari Corrigan, Tim McCoy | |
The section consists of large (up to 2 mm) chondrules in a matrix of granoblastic silicates, sulfides and magnetite. Weathering is minor. Silicates are homogeneous. Olivine is Fa32 and orthopyroxene is Fs26. The meteorite is a CK5 chondrite. | |
Reclassification Notes (AMN 36,1) | |
This sample was originally classified as a CK5 chondrite, but chemical analyses reveal that it is very close in composition (Zn/Mn vs. Al/Mn) to many other LL chondrites (Isa, M. et al., 2011, LPSC abstract #1876). This information, together with the observation that there is metal present and no magnetite, has led us to reclassify this sample as an LL5 chondrite. |
Antarctic Meteorite Images for Sample MAC 02453 | ||||
Lab Photo(s) : | ||||
References for Sample MAC02453 | |
Kubuki, S., Iwanuma, J., Akiyama, K., Isa, M., Shirai, N., Ebihara, M., and Nishida, T., 2012, Reclassification of CK chondrites confirmed by elemental analysis and Fe-Mössbauer spectroscopy, Hyperfine Interactions, 208, 75-78, DOI 10.1007/s10751-011-0427-0. | |
Rubin, A. E., Huber, H., 2005, A weathering index for CK and R chondrites. Meteoritics & Planetary Science, 40, 1123-1130, http://dx.doi.org/10.1111/j.1945-5100.2005.tb00178.x. |