ECB-ART-48041
Science
1967 Sep 01;1573792:1048-50. doi: 10.1126/science.157.3792.1048.
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Echinoderm calcite: single crystal or polycrystalline aggregate.
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Electron microscopy of natural and broken surfaces of echinoid skeletal plates reveals that the interior portions have the morphology of a single crystal, whereas the exterior is a polycrystalline aggregate with preferred orientation. These data help to resolve earlier contradictory x-ray and optical evidence.
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