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Petrographic Descriptions (Select a sample)
| Sample Number | MIL 07666 |
|---|---|
| Pairing | |
| Newsletter | 31,2 |
| Location | Miller Range |
| Field Number | 18159 |
| Dimensions | 5.0 x 2.9 x 1.4 |
| Weight | 96.25 |
| Original Classification | Iron (IIAB) |
| Macroscopic Description - Cari Corrigan and Linda Welzenbach | |
| This lozenge-shaped meteorite is flight oriented with a slight melt flange on the top side. The bottom or flight surface is finely pitted, the top side smoother but with sporadic, deeper regmaglypts. Fusion crust is 100% and exhibits mild oxidation in the form of iridescence and minor halos. | |
| Thin Section Description - Tim McCoy, Cari Corrigan and Linda Welzenbach | |
| The meteorite was examined from a cut and etched surface, which bisected one end or nose of the specimen. A thin fusion crust is preserved over most of the meteorite, and gradational heat alteration zone of approximately 1.0-2 mm thick underlies the fusion crust on the bottom or flight side, and is less than 0.3 mm thick on the top side. A prominent coarse a2 structure is found throughout. The section exhibits subequant grains ranging up to 1 mm in size which meet at 120° triple junctions throughout. The grains often exhibit sub-grain boundaries with subgrains of 100-200 microns decorated by taenite precipitates. One prominent fracture with iron oxides cross cuts the specimen following grain boundaries. Equant schreibersites up to ~300 microns are observed. A line scan across the meteorite suggests a composition of 5.4 wt.% Ni and 0.3 wt.% P. The meteorite is an iron. The composition suggests a tentative classification of IIAB. | |
| Antarctic Meteorite Images for Sample MIL 07666 | ||||
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