Figure 7-11. View in cross-polarized light of columnar calcite crystals with layers of clear and inclusion-rich calcite. Note that individual crystals persist across many layers (n fact, many more than are show here). Also note the somewhat irregular (non-linear) boundaries between the columnar calcite crystals (red arrows), and the slightly variable extinction within some of them (as at left). A view of the same area in plane-polarized light shows that these crystal boundaries are unrecognizable there.      Photomicrograph was taken in cross-polarized light; field of view is 2.2 mm wide. Anjohibe Cave, Madagascar; Stalagmite MA2; thin section MA2-1. Sample collected by Dr. George A. Brook.
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