Kaersutite on tuff matrix.Rock sample belongs to Geo collection of author.
<a href="//commons.wikimedia.org/wiki/User:Marek_Novot%C5%88%C3%A1k" title="User:Marek Novotňák">Marek Novotňák</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>