| Pairing |
|
| Newsletter |
31,2 |
| Location |
Miller Range |
| Field Number |
18613 |
| Dimensions |
4.5 x 3.0 x 1.2 |
| Weight |
60.835 |
| Original Classification |
Iron (Ungrouped) |
| Macroscopic Description - Cari Corrigan and Linda Welzenbach |
| This amoeboid-shaped meteorite is finely pitted over the entire surface. Fine flow lines are visible along prominent edges. Fusion crust is 80-90% and exhibits mild oxidation in the form of iridescence and minor halos. Fractures occur in several places over the surface and cross cut some of the lobes. |
| Thin Section Description - Tim McCoy, Cari Corrigan and Linda Welzenbach |
| The meteorite was examined from a cut and etched surface, which bisected one of the three distinct lobes of the specimen. Fusion crust reaching up to 0.4 mm in thickness is preserved over half the meteorite and a prominent fine a2 structure is present throughout. Short kamacite lamellae exceed 2 mm in width and are separated by thin (~100 micron wide) ribbons of taenite, which are often replaced by hydrated iron oxides of terrestrial origin. Many of the kamacite grains exhibit subgrains of a few hundred microns in size. Also present are ellipsoidal melt pockets with dendritic intergrowths of metallic and phosphorus-rich melt. A line scan across the meteorite suggests a composition of 6.6 wt.% Ni and 0.1 wt.% P. The meteorite is an iron. We tentatively classify it as ungrouped, recognizing that the section is so small and the structure so coarse that it is likely not representative of the larger mass from which it was derived. Of the known major groups, it is most similar to IAB, although at the extreme low-Ni, low-P composition for this group. |
