Microscopic image of petal-like crack patterns formed upon drying out of  droplets of  silica particles.
<b>Derivative work: </b> <a href="//commons.wikimedia.org/w/index.php?title=User:VVJBP&amp;action=edit&amp;redlink=1" class="new" title="User:VVJBP (page does not exist)">VVJBP</a>
CC BY-SA 4.0
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