Sample Petrographic Description
| Sample Number | MIL 05085 |
| Newsletter | 29,2 |
| Location | Miller Range |
| Field Number | 18731 |
| Dimensions (cm) | 3.0 x 1.5 x 2.5 |
| Weight (g) | 18.65 |
| Original Classification | Howardite |
| Mineral Composition (%Fa & %Fs) | |
| Ferrosilite (mol%): 27-60 | |
| Weathering | |
| B | |
| Fracturing | |
| B | |
| Macroscopic Description - Kathleen McBride | |
| Only 5% of the exterior has shiny black fusion crust. The interior is a gray and tan matrix with vugs and white, black, gray and tan clasts. | |
| Thin Section Description (,2) - Tim McCoy | |
| The section shows a groundmass of comminuted pyroxene and plagioclase (up to 0.5 mm) with fine to coarse-grained basaltic clasts ranging up to 2 mm. Impact melt glass, including melt spherules, is present. Pyroxene exhibits a broad range of compositions (Fs60Wo6 to Fs27Wo42) and many grains exhibit twinning. The Fe/Mn ratio of the pyroxene is ~30. Plagioclase is ~An88Or0.2. The meteorite is a howardite. | |
| Antarctic Meteorite Images for Sample MIL 05085 | ||||
| Field Photo(s) : | ||||
 |
||||
| Field photo image(s) courtesy of the ANSMET (ANtarctic Search for METeorites) Program, Case Western Reserve University and the University of Utah | ||||
| Antarctic Meteorite Images for Sample MIL 05085 | ||||
| Lab Photo(s) : | ||||
 |
 |
 |
||
| References for Sample MIL05085 | |
| Singerling, S. A., Mcsween, H. Y., Taylor, L. A., 2013, Glasses in howardites: Impact melts or pyroclasts?. , Meteoritics & Planetary Science, 48 , 715-729 , http://dx.doi.org/10.1111/maps.12099 . | |
| 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 . | |