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 - Archive ouverte HAL Access content directly
Journal Articles Mineralogical Magazine Year : 2008

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

(1, 2) , (3) , (3) , (3) , (3)
1
2
3

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.
Not file

Dates and versions

insu-00378666 , version 1 (25-04-2009)

Identifiers

  • HAL Id : insu-00378666 , version 1

Cite

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, 2008, 72 (2), pp.617-626. ⟨insu-00378666⟩
74 View
0 Download

Share

Gmail Facebook Twitter LinkedIn More