Unknown object found off the <i><a href="https://en.wikipedia.org/wiki/Waitomo_Glowworm_Cave" class="extiw" title="w:Waitomo Glowworm Cave">w:Waitomo Glowworm Cave</a></i>, <a href="//commons.wikimedia.org/wiki/New_Zealand" class="mw-redirect" title="New Zealand">New Zealand</a>. <del>Probably a <a href="//commons.wikimedia.org/wiki/Meteorite" title="Meteorite">meteorite</a>?</del> Likely some sort of slag.
<a href="//commons.wikimedia.org/wiki/User:Hgrobe" title="User:Hgrobe">Hannes Grobe</a> (<a href="//commons.wikimedia.org/wiki/User_talk:Hgrobe" title="User talk:Hgrobe"><span class="signature-talk">talk</span></a>)
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>