Sample Petrographic Description
Sample Number | LAP 031342 |
Newsletter | 29,2 |
Location | LaPaz Ice Field |
Field Number | 16276 |
Dimensions (cm) | 1.75 x 1.5 x 0.75 |
Weight (g) | 3.18 |
Original Classification | Ureilite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 2-21 | |
Weathering | |
C | |
Fracturing | |
A/B | |
Macroscopic Description - Kathleen McBride | |
The exterior has brown/black fusion crust with oxidation halos. The interior has a crystalline matrix with rust and high metal. The interior is gray with glass vein (?). Some areas are vesicular and others are white and powdery. | |
Thin Section Description (,2) - Linda Welzenbach, Valerie Reynolds | |
The section consists of an aggregate of large olivine and pyroxene grains up to 2 mm across. Individual olivine grains are rimmed by carbon-rich material containing traces of metal. Olivine has cores of Fa21, and rims of Fa2. Pigeonite is Fs18,Wo6. The meteorite is a ureilite. |