A sample of <a href="https://en.wikipedia.org/wiki/cerium(IV)_oxide" class="extiw" title="w:cerium(IV) oxide">cerium(IV) oxide</a> (CeO<sub>2</sub>)
<a href="//commons.wikimedia.org/wiki/User:Walkerma" title="User:Walkerma">User:Walkerma</a>.
August 2005 ; 24 August 2005 (according to <a href="https://en.wikipedia.org/wiki/Exchangeable_image_file_format" class="extiw" title="en:Exchangeable image file format">Exif</a> data)
<span class="int-own-work" lang="en">Own work</span>