Of course, weather on earth can make complex structures as well from non-organic materials: <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Desert_rose_%28crystal%29" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Desert_rose_%28crystal%29</a>