Chalcanthite and Gypsum - Canaveille mine - Pyrénées Orientales France (20x16cm)
<a href="//commons.wikimedia.org/wiki/User:Archaeodontosaurus" title="User:Archaeodontosaurus">Didier Descouens</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>