Crystal structure of <a href="https://en.wikipedia.org/wiki/Copper(II)_sulfide" class="extiw" title="en:Copper(II) sulfide">en:Copper(II) sulfide</a>
<a href="//commons.wikimedia.org/wiki/User:Orci" title="User:Orci">Orci</a>
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Eigenes Werk (own work), data source: Howard T. Evens, ,Judidth A. Konnert: Crystal structure refinement of covellite. In: American Mineralogist, 61, S. 996-1000, 1976, <a rel="nofollow" class="external text" href="http://www.minsocam.org/ammin/AM61/AM61_996.pdf">pdf</a>