Figure 1-8. SEM image of columnar calcite (C) in a stalagmite from Carlsbad Caverns. Growth direction is to left. Scanning electron microscope secondary electron image generated with a 5 keV acccelerating voltage; white scale bar at lower right is 5 microns long. Georgia Giant speleothem, Carlsbad Caverns, New Mexico, U.S.A; Sample CB69. Sample collected by Dr. George A. Brook; image generated with the kind help of Dr. John P. Shields of the University of Georgia Center for Advanced Ultrastructural Research. |
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