Rubellite, Nikon D3000, polarized optical microscope, focus stacking image
<a href="//commons.wikimedia.org/w/index.php?title=User:Photo3.0&amp;action=edit&amp;redlink=1" class="new" title="User:Photo3.0 (page does not exist)">Photo3.0 (Gianluca Nicoli)</a>
CC BY 4.0
<span class="int-own-work" lang="en">Own work</span>