Crystallization of biogenic Ca-carbonate within organo-mineral micro-domains. Structure of the calcite prisms of the PelecypodPinctada margaritifera(Mollusca) at the submicron to nanometre ranges
- 1 April 2008
- journal article
- research article
- Published by Mineralogical Society in Mineralogical Magazine
- Vol. 72 (2), 617-626
- https://doi.org/10.1180/minmag.2008.072.2.617
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 shellPinctada 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.Keywords
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