Sample Petrographic Description
Sample Number | MIL 07662 |
Newsletter | 31,2 |
Location | Miller Range |
Field Number | 18352 |
Dimensions (cm) | 4.5 x 5.0 x 2.0 |
Weight (g) | 51.36 |
Original Classification | Eucrite (Brecciated) |
Mineral Composition (%Fa & %Fs) | |
Ferrosilite (mol%): 45-54 | |
Weathering | |
B/C | |
Fracturing | |
B | |
Macroscopic Description - Kathleen McBride | |
Black fusion crust that is shiny and ropey covers 15% of the exterior. Areas without fusion crust are a dirty gray color with large pinkish area and black and white inclusions. The interior looks the same as the exterior minus the fusion crust. | |
Thin Section Description (,5) - Tim McCoy, Linda Welzenbach | |
The section is a breccia with mono- and polyminerallic clasts of pyroxene and plagioclase up to 1 mm in diameter in a fine-grained melt-textured matrix which is coarser-grained on one half of the section and cryptocrystalline on the other half. Pyroxene is finely exsolved, yielding pigeonitic compositions of Fs45-54Wo5-15 and plagioclase is An86-93Wo0-1 The Fe/Mn ratio of the pyroxene is ~28. The meteorite is a eucritic impact melt breccia. | |
Oxygen Isotopic Composition - Z. Sharp, University of New Mexico | |
Oxygen isotopic analyses of two splits yielded the following results which fall in the HED meteorite field. All samples were cleaned in a 10% HCl solution for 1 minute, followed by ultrasonication. δ17O = 1.68, δ18O =3.86, Δ17O = -0.33 δ17O = 1.59, δ18O = 3.70, Δ17O = -0.34 δ17O =1.64, δ18O = 3.89, Δ17O = -0.38 [Where Δ17O = δ17O - 0.52 x δ18O] |
Antarctic Meteorite Images for Sample MIL 07662 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample MIL 07662 | ||||
Thin Section Photo(s) : | ||||