…looks like this.
“…a grain of sodium sulfate and sodium chloride (salt) while researching jet turbine safety. Jet turbines become very hot when in use and are also exposed to the atmosphere. This combination can lead to compounds such as salt encrusting the turbines. Rosier and her colleagues reproduced and photographed one such salt grain in the laboratory.”
Image by Hollie Rosier of Swansea University, Winner of the 2012 2012 Research as Art competition. Via Live Science.