Sample Petrographic Description
Sample Number | LAP 04846 |
Newsletter | 29,2 |
Location | LaPaz Ice Field |
Field Number | 17409 |
Dimensions (cm) | 1.0 x 0.75 x 0.5 |
Weight (g) | 0.51 |
Original Classification | Eucrite (Brecciated) |
Mineral Composition (%Fa & %Fs) | |
Ferrosilite (mol%): 12-41 | |
Weathering | |
B | |
Fracturing | |
A/B | |
Macroscopic Description - Kathleen McBride | |
80% of exterior has shiny black fusion crust. The gray matrix has some rust stains and white inclusions are visible. | |
Thin Section Description (,2) - Tim McCoy, Valerie Reynolds | |
This meteorite consists of a brecciated matrix that contains abundant coarse (up to 2 mm) mineral fragments and rare polyminerallic clusters. Mineral compositions are relatively homogeneous with orthopyroxene (Fs41Wo2), with lamellae of augite (Fs12Wo45), and plagioclase (An91Or0.5). The Fe/Mn ratio of the pyroxene is ~30. The meteorite is a brecciated eucrite. |