Figure 5-1. Rounded quartz grain (Q) amidst spelean calcite (C) in a stalgmite. Photomicrograph was taken in cross-polarized light; field of view is 0.8 mm wide. Drotsky's Cave, Botswana; Stalagmite DS87; thin section BDS1.5-2; sample collected by Drs. George A. Brook and John Cooke.
  Speleothem Image
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