Crystal structure of <a href="https://en.wikipedia.org/wiki/Gallium" class="extiw" title="en:Gallium">δ-Gallium</a>
<a href="//commons.wikimedia.org/wiki/User:Orci" title="User:Orci">Orci</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>