Journal
ADVANCED MATERIALS
Volume 20, Issue 8, Pages 1555-+Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.200702842
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A convenient tooth. Here we investigate how the different kinds of calcite crystals in a sea urchin tooth (left) work together as an effective grinding tool. The polycrystalline matrix has a higher elastic modulus and hardness than the single crystals, yet both work together to produce a flat grinding surface (right).
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