Figure 2-3. Large botryoids of aragonite (A) and small botryoids of aragonite (a) amidst calcite (C). Note dark vertical and horizontal zones of aragonite botryoids; they sweep around the botryoid as the microscope stage is rotated because they remain parallel to the microscopes's polarizing filters. A corresponding image shows the same area in plane-polarized light.      Photomicrograph was taken in cross-polarized light; field of view is 2.0 mm wide. Carlsbad Caverns, New Mexico, U.S.A.; Georgia Giant Stalagmite; thin section CB78. Sample collected by Dr. George A. Brook.
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