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Face-Changing Dust

Caption: In the presence of water vapor, calcite crystals (left columns) react with nitric acid to form liquid calcium nitrate particles (right columns). These electron microscopy images illustrate the formation of these new particles in laboratory-controlled experiments with commercial calcite powders (top) and in a sample of authentic dust (bottom), loess collected in a region of China where the loamy soil is high in calcium and particularly reactive.

Credit: Courtesy of Pacific Northwest National Laboratory.

Usage Restrictions: Image courtesy of Pacific Northwest National Laboratory. Use of image shall not claim any expressed or implied affiliation with, or endorsement by, Battelle Memorial Institute, Pacific Northwest National Laboratory or the U.S. Department of Energy.