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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

Published online by Cambridge University Press:  05 July 2018

A. Baronnet
Affiliation:
Université Paul Cézanne and CRMCN-CNRS, UPR 7251, Campus Luminy, Case 913, 13288- Marseilles cedex 9, France
J. P. Cuif*
Affiliation:
UMR 8148 IDES, Bat. 504, Université Paris XI, 91405 Orsay cedex, France
Y. Dauphin
Affiliation:
UMR 8148 IDES, Bat. 504, Université Paris XI, 91405 Orsay cedex, France
B. Farre
Affiliation:
UMR 8148 IDES, Bat. 504, Université Paris XI, 91405 Orsay cedex, France
J. Nouet
Affiliation:
UMR 8148 IDES, Bat. 504, Université Paris XI, 91405 Orsay cedex, France
*

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 μm 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 μm-scale, these results give unexpected views regarding the modalities of biocrystallization.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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