Fig. 3: 3D APT reconstruction showing parts of the nacre tablet and the organic interlamellar sheet in Sr-labelled nacre (specimen: M2S2R).
From: Growth dynamics and amorphous-to-crystalline phase transformation in natural nacre
a Iso-concentration surfaces of Ca (50 at%, grey) depicting the outer area of a nacre tablet and elevated C (5.1 at%, magenta) identifies the organic interlamellar sheet. b Iso-concentration surfaces of H (10 at%, yellow) co-located with high C concentrations in the organic interlamellar sheet. c The iso-concentration surface of Sr (20 at%, red) shows a distinct Sr-rich area situated between Sr-poor aragonite within the mineral fraction. d Volume rendering showing the distribution of Sr across the volume of the reconstruction highlighting the Sr-enriched area (red to yellow) in the nacre tablet. e Iso-concentration surfaces of Na (8 at%, green) forms a distinct cluster within the mineral phase next to the Sr-rich area. f Schematic representation of the APT reconstruction (red box) and its relative position within the tip as well as within the nacreous architecture more generally.
