Figure 8-5.  A: Two crystals of calcite (C) that have replaced original fabric in a stalagmite rich in microcrystalline and detrital material. Arrows point to limits of crystal on right. B (inset): Same crystals in cross-polarized light with a gypsum plate in the light path. This image documents that the calcite crystal on the right indeed extends to the limits shown in A.    Photomicrograph A was taken in plane -polarized light; field of view of A is 2.2 mm wide. Wonderwerk Cave, South Africa; thin section WW19. Sample collected by Dr. George A. Brook.
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