Sample Petrographic Description
Sample Number | GRA 06189 |
Newsletter | 30,2 |
Location | Graves Nunataks |
Field Number | 17753 |
Dimensions (cm) | 1.5 x 1.5 x 1.0 |
Weight (g) | 2.94 |
Original Classification | Eucrite (Unbrecciated) |
Mineral Composition (%Fa & %Fs) | |
Ferrosilite (mol%): 60 | |
Weathering | |
B | |
Fracturing | |
B | |
Macroscopic Description - Kathleen McBride | |
Shiny black fusion crust with fine “wrinkles” covers the exterior of this achondrite. The interior matrix ranges from dark to light gray with patches of yellow brown areas. | |
Thin Section Description - Tim McCoy, Lauren LaCroix, Linda Welzenbach | |
The section consists of a coarse-grained unbrecciated gabbro composed of pyroxene and plagioclase with grain sizes reaching 3 mm. Shock effects are pervasive, including mosaicism in both pyroxene and plagioclase. Silicates are homogeneous with orthopyroxene of Fs60Wo2, clinopyroxene of Fs26Wo43 (Fe/Mn~30) and plagioclase of An90. The meteorite is an unbrecciated eucrite. |
Antarctic Meteorite Images for Sample GRA 06189 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample GRA 06189 | ||||
Thin Section Photo(s) : | ||||