Figure 5-3. Grain of clay and Fe oxide (red arrow) and quartz grain (Q) with coating of similar material (green arrows) amidst calcite (C). "P" indicates pores. Energy-dispersive X-ray analysis suggests that the clay is a Mg-bearing smectite and confirms the presence of Fe (Railsback et al., 1999).       Photomicrograph was taken in plane-polarized light; field of view is 0.7 mm wide. Location; Stalagmite DS87; thin section BDS1.5-2; sample collected by Drs. George A. Brook and John Cooke.
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