Sample Petrographic Description
Sample Number | LAP 031280 |
Newsletter | 29,1 |
Location | LaPaz Ice Field |
Field Number | 16046 |
Dimensions (cm) | 4.0 x 2.75 x 1.0 |
Weight (g) | 17.75 |
Original Classification | Eucrite (Brecciated) |
Mineral Composition (%Fa & %Fs) | |
Ferrosilite (mol%): 60 | |
Weathering | |
B | |
Fracturing | |
A/B | |
Macroscopic Description - Kathleen McBride | |
Shiny, rough brown/black fusion crust covers 50% of this achondrite's exterior. The interior is a sandy textured, tan colored matrix with gray inclusions. | |
Thin Section Description (,2) - Tim McCoy, Linda Welzenbach | |
The meteorite is a dominated by a fine-grained (50-100 micron grain size) basaltic host with coarser-grained areas that may be clasts incorporated prior to metamorphism. Pyroxene is exsolved on a 1-20 micron scale. Orthopyroxene analyses range to Fs60Wo5 and augite to Fs32Wo40. Plagioclase is An88Or0.5. The Fe/Mn ratio of the pyroxene is ~30. The meteorite is a eucrite. |
Antarctic Meteorite Images for Sample LAP 031280 | ||||
Lab Photo(s) : | ||||