Crystal structure of <a href="https://en.wikipedia.org/wiki/Calcium_hexaboride" class="extiw" title="en:Calcium hexaboride">en:Calcium hexaboride</a>
<a href="//commons.wikimedia.org/wiki/User:Orci" title="User:Orci">Orci</a>
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<span class="int-own-work" lang="en">Own work</span>, data source: Jean Etourneau, Jean-Pierre Mercurio, Roger Naslain, Paul Hagenmuller: Structure Electronique de Quelques Hexaborures de Type CaB<sub>6</sub>. In: Journal of Solid State Chemistry, Volume 2, Issue 3, November 1970, Pages 332-342.