<http://schema.org/about>
"Nacre, or Mother of pearl is the iridescent lining you see on the inside of an oyster, mussel, or abalone shell. It is also the same material that creates pearls. The play of light we find so appealing is a result of the little beasties engineering the"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/clean-technology/biomimicry-nacre-inspires-transparent-strong-as-steel-plastic.html>