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Crystallization of biogenic Ca-carbonate within organo-mineral micro-domains. Structure of the calcite prisms of the Pelecypod Pinctada margaritifera (Mollusca) at the submicron to nanometre ranges

Abstract : Atomic force microscopy (AFM) and transmission electron microscopy (TEM) were used to investigate the fine structure of the calcite prisms from the pearl-oyster shell Pinctada margaritifera. The AFM analysis shows that the prisms are made of densely packed circular micro-domains (in the 0.1 mm range) surrounded by a dense cortex. The TEM images and diffraction patterns allow the internal structure of the micro-domains to be described. Each of them is enriched in Ca-carbonate. Hosted in distinct regions of each prism, some are fully amorphous, and some others fully crystallized as subunits of a large calcite single crystal. At the border separating the two regions, micro-domains display a crystallized core and an amorphous rim. Such a border probably marks out an arrested crystallization front having propagated through a previously bio-controlled architecture of the piling of amorphous micro-domains. Compared to recent data concerning the stepping mode of growth of the calcite prisms and the resulting layered organization at the mm-scale, these results give unexpected views regarding the modalities of biocrystallization.
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https://hal-insu.archives-ouvertes.fr/insu-00378666
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Submitted on : Saturday, April 25, 2009 - 10:46:21 AM
Last modification on : Wednesday, November 3, 2021 - 3:20:08 PM

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  • HAL Id : insu-00378666, version 1

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Alain Baronnet, Jean-Pierre Cuif, Yannicke Dauphin, B. Farre, Nouet Julius. Crystallization of biogenic Ca-carbonate within organo-mineral micro-domains. Structure of the calcite prisms of the Pelecypod Pinctada margaritifera (Mollusca) at the submicron to nanometre ranges. Mineralogical Magazine, Mineralogical Society, 2008, 72 (2), pp.617-626. ⟨insu-00378666⟩

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