Figure F3. A. Alteration halo around a zeolite vein in fresh volcanic glass. B. Mn oxide-encrusted, subspherical microbial cell forms in a zeolite vein. Both images after Thorseth et al. (this volume).

Figure F3. A. Alteration halo around a zeolite vein in fresh volcanic glass. B. Mn oxide-encrusted, subspherical microbial cell forms in a zeolite vein. Both images after Thorseth et al, in press.