Sample Petrographic Description
Sample Number | MIL 07007 |
Newsletter | 31,2 |
Location | Miller Range |
Field Number | 18637 |
Dimensions (cm) | 4.0 x 2.0 x 3.0 |
Weight (g) | 29.38 |
Original Classification | Howardite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 10-12;Ferrosilite (mol%): 21-61 | |
Weathering | |
A/B | |
Fracturing | |
A/B | |
Macroscopic Description - Kathleen McBride | |
The exterior has 40% dark brown to black fusion crust with polygonal fractures. Interior that is exposed is tan with numerous inclusions of various shapes, sizes and colors. The interior is a light gray matrix with cream colored inclusions <3 mm in size, tiny black specks and a couple of rusty places. | |
Thin Section Description (,4) - Tim McCoy, Linda Welzenbach, Cari Corrigan, Rhiannon Mayne | |
The section shows a groundmass of comminuted pyroxene and plagioclase (up to 1 mm) with fine- to coarse-grained basaltic clasts ranging up to 1 mm. There appear to be a number of impact melt fragments. Orthopyroxene ranges from Fs21-61Wo1-4 (most Fs20-30), and augite ranges up to Fs21Wo41 and olivine of Fa10-12. The meteorite is a howardite. |
Antarctic Meteorite Images for Sample MIL 07007 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample MIL 07007 | ||||
Thin Section Photo(s) : | ||||
References for Sample MIL07007 | |
Patzer, A., McSween Jr., H. Y., 2012, Ordinary (mesostasis) and not-so-ordinary (symplectites) late-stage assemblages in howardites. Meteoritics & Planetary Science, 47, 1475-1490, http://dx.doi.org/10.1111/j.1945-5100.2012.01408.x. |