Antarctic Search for Meteorites (ANSMET) Search this
Place:
Antarctica
Collection Date:
1983
Notes:
# NASA data for ALH 83014 Weathering: B Fracturing: A Fa: 18 mol % Fs: 15 mol %
Weathered fusion crust covers only one surface of this ureilite. Well-developed crystal faces are visible on all other surfaces. The overall color is reddish-brown.
The thin section shows an aggregate of rounded to subhedral grains (0.6-3 mm across) of olivine with minor pyroxene. Small platy crystals of graphite are present in carbonaceous rims to the silicate grains. Trace amounts of troilite and nickel-iron are present, the latter largely altered to translucent brown limonite concentrated along grain boundaries. Microprobe analyses show olivine of uniform composition (Fa₁₈) with notably high CaO (0.4%) and Cr₂O₃ (0.7%) contents; the pyroxene is a pigeonite of composition Wo₈Fs₁₅. This meteorite is a ureilite; it appears to be relatively unshocked compared to most ureilites.
