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.
<a href="//commons.wikimedia.org/w/index.php?title=User:Ppm61&amp;action=edit&amp;redlink=1" class="new" title="User:Ppm61 (page does not exist)">Зеленский Михаил Евгеньевич</a>
<span class="int-own-work" lang="en">Own work</span>