Figure 8-1. Two botryoids of aragonite (A) in which equant crystals of calcite (C) have engulfed needles of aragonite (visible at red arrows). This replacement of aragonite by calcite is reminiscent of neomorphism of aragonite to calcite in limestones, a process that commonly produces equant calcite with curved crystal boundaries and with vestiges of the original structure..    Photomicrograph was taken in cross -polarized light; field of view is 1.6 mm wide. Carlsbad Caverns, New Mexico, U.S.A.; Georgia Giant speleothem; thin section CB 94. Sample collected by Dr. George A. Brook.
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