Fig. 1.  Meteorite ALH 84001:  backscattered electron image (BSE) of a polished thin section [13]. 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).