Sample Petrographic Description
Sample Number | ALH 94007 |
Newsletter | 19,2 |
Location | Allan Hills |
Field Number | M17 |
Dimensions (cm) | 1.5 x 1.0 x 0.75 |
Weight (g) | 1.24 |
Original Classification | L3.4 Chondrite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 7-38;Ferrosilite (mol%): 1-21 | |
Weathering | |
C | |
Fracturing | |
B/C | |
Macroscopic Description - Kathleen McBride | |
The exterior surface of this meteorite is weathered brown with thin patches of fusion crust. Fractures penetrate the surface. The interior is brown with heavy oxidation and some metal visible. | |
Thin Section Description (,2) - Brian Mason | |
The section shows numerous chondrules (up to 1.8 mm across), chondrule fragments, and mineral grains in a black matrix that contains a small amount of nickel-iron and troilite. The meteorite is considerably weathered, with limonitic staining and patches of brown limonite throughout the section. Microprobe analyses show olivine and pyroxene of variable composition: olivine, Fa7-38, mean Fa17: pyroxene, Fa1-21. The meteorite is classified as an L3 chondrite (estimated L3.4). |
Antarctic Meteorite Images for Sample ALH 94007 | ||||
Thin Section Photo(s) : | ||||