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Echinoderm Calcite: Single Crystal or Polycrystalline Aggregate

Kenneth M. Towe
Science
New Series, Vol. 157, No. 3792 (Sep. 1, 1967), pp. 1048-1050
Stable URL: http://www.jstor.org/stable/1722224
Page Count: 3
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Abstract

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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