Fig. 1. Meteorite ALH 84001: backscattered electron image (BSE) of a polished thin
section . Light colors denote high average atomic number (~density). Semicircular features are
carbonate-rich ellipsoids, concentrated in and replacing plagioclase (P), which is now shock glass
(maskelynite). Note strong compositional zoning. White grains are chromite and pyrite; most of field
at top and bottom is orthpyroxene (light gray).