|Figure 8-10. Fracture in spelean calcite (C) partly filled or healed by two zones of fracture-filling calcite (F). Arrows of different colors indicate matching points along original fracture surface. Nearly half the fracture remains unfilled void space (V). This fracture is in the lower part of a large column, and it presumably resulted from differential movement of the cave ceiling and floor.
Image is a mosaic of two photomicrographs taken in plane-polarized light; field of view is 3.4 mm wide. Carlsbad Caverns, New Mexico, U.S.A.; Georgia Giant stalagmite; thin section CB121 Sample collected by Dr. George A. Brook.
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