Crystal structure of <a href="https://en.wikipedia.org/wiki/Gallium" class="extiw" title="en:Gallium">Gallium-II</a>
<a href="//commons.wikimedia.org/wiki/User:Orci" title="User:Orci">Orci</a>
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Own work, data source: Louis Bosio: Crystal structure of Ga(II) and Ga(III). In: J. Chem.Phys., 1978, 68, 3, S. 1221-1223.