Sphalerit-Chalkopyrit-Trum der kiesig-blendigen Bleierzformation (kb),
Grube "Reiche Zeche", Freiberg (Sachsen)
<a href="//commons.wikimedia.org/wiki/User:Dryhand58" title="User:Dryhand58">Dryhand58</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>