Sample Petrographic Description
| Sample Number | MIL 07664 |
| Newsletter | 32,1 |
| Location | Miller Range |
| Field Number | 18765 |
| Dimensions (cm) | 3.0 x 2.5 x 2.0 |
| Weight (g) | 30.56 |
| Original Classification | Howardite |
| Mineral Composition (%Fa & %Fs) | |
| Ferrosilite (mol%): 20-64 | |
| Weathering | |
| A | |
| Fracturing | |
| A | |
| Macroscopic Description - Kathleen McBride | |
| Brown/black fusion crust with shiny patches covers 95% of this meteorite’s exterior surface. The interior is a gray to tan matrix with white and dark gray inclusions and tan clasts. | |
| Thin Section Description (,4) - Tim McCoy, Linda Welzenbach | |
| 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. Several clasts are aphanitic or exhibit acicular pyroxenes suggestive of an origin as impact melts. Pyroxene includes diogenite-like compositions (Fs20Wo2) and eucrite-like compositions (Fs21-64Wo1-40). Plagioclase is An85-92. The meteorite is a howardite. | |
| Antarctic Meteorite Images for Sample MIL 07664 | ||||
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| 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 07664 | ||||
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| Antarctic Meteorite Images for Sample MIL 07664 | ||||
| Thin Section Photo(s) : | ||||
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| References for Sample MIL07664 | |
| Mayne, R. G., Smith, S. E., Corrigan, C. M., 2016, Hiding in the howardites: Unequilibrated eucrite clasts as a guide to the formation of Vesta's crust. Meteorit Planet Sci, 51, 2387–2402, doi:10.1111/maps.12730. | |