TEM images of silica-organic matrix-based suspension obtained after mechanical disruption of spicules in deionized water (a). Crystallites of organic nature are embedded in amorphous silica (b).
<a href="//commons.wikimedia.org/wiki/User:Florentyna" title="User:Florentyna">Florentyna</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>