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".To Read the Whole Article, Visit: Sea urchin spine structure inspires idea for concrete ##I Dig Crystalsidigcrystals@gmail.com

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