crystal structure of <a href="https://en.wikipedia.org/wiki/Yttrium_trifluoride" class="extiw" title="en:Yttrium trifluoride">en:Yttrium trifluoride</a>
<a href="//commons.wikimedia.org/wiki/User:Orci" title="User:Orci">Orci</a>
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Eigenes Werk (own work), data source: Allan Zalkin, and D. H. Templeton: The Crystal Structures of YF3 and Related Compounds, J. Am. Chem. Soc., 1953, 75 (10), 2453-2458