Myriad Mapping of nanoscale minerals reveals calcium carbonate hemihydrate in forming nacre and coral biominerals - UFR de Chimie de Sorbonne-Université
Journal Articles Nature Communications Year : 2024

Myriad Mapping of nanoscale minerals reveals calcium carbonate hemihydrate in forming nacre and coral biominerals

Éric Tambutté
Alexander Venn
Zhaoyong Zou
Hans Bechtel
Samantha Anglemyer
Isaac Kohler
Jaiden Mezera
Madeline Patton
Tarak Sristy
Sylvie Tambutté

Abstract

Calcium carbonate (CaCO 3 ) is abundant on Earth, is a major component of marine biominerals and thus of sedimentary and metamorphic rocks and it plays a major role in the global carbon cycle by storing atmospheric CO 2 into solid biominerals. Six crystalline polymorphs of CaCO 3 are known—3 anhydrous: calcite, aragonite, vaterite, and 3 hydrated: ikaite (CaCO 3 ·6H 2 O), monohydrocalcite (CaCO 3 ·1H 2 O, MHC), and calcium carbonate hemihydrate (CaCO 3 ·½H 2 O, CCHH). CCHH was recently discovered and characterized, but exclusively as a synthetic material, not as a naturally occurring mineral. Here, analyzing 200 million spectra with Myriad Mapping (MM) of nanoscale mineral phases, we find CCHH and MHC, along with amorphous precursors, on freshly deposited coral skeleton and nacre surfaces, but not on sea urchin spines. Thus, biomineralization pathways are more complex and diverse than previously understood, opening new questions on isotopes and climate. Crystalline precursors are more accessible than amorphous ones to other spectroscopies and diffraction, in natural and bio-inspired materials.
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hal-04778419 , version 1 (12-11-2024)

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Connor Schmidt, Éric Tambutté, Alexander Venn, Zhaoyong Zou, Cristina Castillo Alvarez, et al.. Myriad Mapping of nanoscale minerals reveals calcium carbonate hemihydrate in forming nacre and coral biominerals. Nature Communications, 2024, 15 (1), pp.1812. ⟨10.1038/s41467-024-46117-x⟩. ⟨hal-04778419⟩
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