Figure 8-6. A. Remnants of aragonite (at arrows) in calcite in a stalagmite. Aragonite appears to have formed at least one continuous layer. Rectangle encloses area of Part B. B: One cluster of aragonite (A). Note undercut lower margin of cluster (at arrows), which suggests that point of nucleation of botryoid has undergone dissolution.
   Photomicrographs were taken in plane -polarized light. Field of view in A is 4.7 mm wide; field of view in B is 0.9 mm wide. DeSoto Caverns, Alabama, U.S.A.; Sample 95A; thin section 95A5. Sample collected by Dr. George A. Brook.
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