Sample Petrographic Description
Sample Number | MAC 041269 |
Newsletter | 29,1 |
Location | MacAlpine Hills |
Field Number | 15820 |
Dimensions (cm) | 2.0 x 1.5 x 1.0 |
Weight (g) | 4.51 |
Original Classification | Howardite |
Mineral Composition (%Fa & %Fs) | |
Ferrosilite (mol%): 56 | |
Weathering | |
B | |
Fracturing | |
B | |
Macroscopic Description - Kathleen McBride | |
50% of the exterior surface is covered with black shiny (like glass) fusion crust. The interior is a black and gray, fine grained matrix with black and white inclusions. Very minor amount of rust is present. | |
Thin Section Description (,2) - 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 5 mm. Pyroxene ranges from pigeonite composition (possibly finely exsolved) of Fs56Wo6 to augite of Fs28Wo40. Plagioclase is An89Or0.5. The meteorite is a howardite. |