An electron micrograph of volcanic sublimates (minerals) in natural colors. Multicolored micron-sized crystals of thallium iodide TlI from orange to greenish on glassy substrate of orange arsenic sulfide. A bright blue crystal is sodium chloride NaCl (halite, table salt), which is a colorless mineral under normal conditions. If a deficit of sodium atoms in the crystal lattice occurs, halite may turn blue. Image size is 700 microns along the long side.