Figure 5-2. Angular quartz grain (Q) amidst spelean calcite (C). Photomicrograph was taken in cross-polarized light; field of view is 0.6 mm wide. The yellow color of the quartz grain in cross-polarized light suggests that the thin section was thicker than the standard 30 micron thickness. Photomicrograph was taken in cross-polarized light; field of view is 0.7 mm wide. Anjohibe cave, Madagascar; Stalagmite MA3; thin section MA3-25; sample collected by Dr. George A. Brook.
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