One of the largest monocrystals (KH<sub>2</sub>PO<sub>4</sub>) in the world, grown by <a href="https://en.wikipedia.org/wiki/Saint-Gobain" class="extiw" title="en:Saint-Gobain">Saint-Gobain</a> for <a href="https://en.wikipedia.org/wiki/Commissariat_%C3%A0_l%27%C3%89nergie_Atomique" class="extiw" title="en:Commissariat à l'Énergie Atomique">CEA</a>
<a href="//commons.wikimedia.org/wiki/User:David.Monniaux" title="User:David.Monniaux">David Monniaux</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>