<a href="https://en.wikipedia.org/wiki/Druse_(geology)" class="extiw" title="en:Druse (geology)">Druse</a> from <a href="https://en.wikipedia.org/wiki/Campanian" class="extiw" title="en:Campanian">Campanian</a> found nearby <a href="https://en.wikipedia.org/wiki/Coesfeld" class="extiw" title="en:Coesfeld">Coesfeld</a>, North Rhine-Westphalia, Germany.
Günter Seggebäing, Coesfeld
CC BY-SA 3.0
Photo taken by <a href="//commons.wikimedia.org/wiki/User:Watzmann" title="User:Watzmann">Watzmann</a>