<a href="https://en.wikipedia.org/wiki/Bertrandite" class="extiw" title="en:Bertrandite">Bertrandite</a> crystal structure as a "ball-and-stick model" looking parallel to the a-axis
<a href="https://de.wikipedia.org/wiki/Ra%27ike" class="extiw" title="de:Ra'ike">Ra'ike</a> (Wikipedia)
2019-08-15
<span class="int-own-work" lang="en">Own work</span>