The precise structure of
sea urchins' strong spines has been unraveled - and the find may
contribute to stronger concrete in the future.
The tough spines are known to be made of calcium carbonate,
which has a number of naturally occurring forms, some more brittle than
others.
X-ray studies now show they are built from "bricks" of the crystal Calcite, with a non-crystalline "mortar".
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