Ultrapure holmium, 17 grams. Original size in cm: 1.5 x 2.5
<p><a href="https://en.wikipedia.org/wiki/User:Jurii" class="extiw" title="en:User:Jurii">Jurii</a>.
</p>
<a href="https://en.wikipedia.org/wiki/User:Lanthanum-138" class="extiw" title="en:User:Lanthanum-138">Lanthanum-138</a> at <a class="external text" href="https://en.wikipedia.org">en.wikipedia</a>
CC BY 3.0
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