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Solving the Crystal Architecture of Coccoliths Using 4D-STEM.

Rebecca C Leghziel1,2, Lia Addadi1, Assaf Gal2

  • 1Department of Chemical and Structural Biology, Weizmann Institute of Science, Rehovot 7610001, Israel.

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|October 7, 2025
PubMed
Summary
This summary is machine-generated.

Marine phytoplankton create complex calcite structures called coccoliths. Four-dimensional scanning transmission electron microscopy (4D-STEM) and computational analysis reveal their intricate crystallography and crystal orientations.

Keywords:
4D-STEMbiomineralizationcoccolithcrystallography

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Area of Science:

  • Biomineralization
  • Marine Biology
  • Materials Science

Background:

  • Marine phytoplankton, particularly coccolithophores, produce intricate calcite biominerals known as coccoliths.
  • Coccolith morphology varies by species, but crystals are systematically arranged around an organic matrix, exhibiting high symmetry.

Purpose of the Study:

  • To demonstrate the capabilities of four-dimensional scanning transmission electron microscopy (4D-STEM) for spatially resolving the crystallography of marine biominerals.
  • To develop a computational pipeline for automated crystal orientation mapping within complex biomineral structures.

Main Methods:

  • Utilizing four-dimensional scanning transmission electron microscopy (4D-STEM) for parallel real-space and diffraction-space recordings.
  • Developing a computational pipeline to automatically determine crystal orientation at the pixel level.

Main Results:

  • Successfully mapped the orientation of entangled and overlapping crystalline building blocks within coccoliths.
  • Demonstrated the ability to decipher the complex network of biomineral superstructures at high resolution.

Conclusions:

  • 4D-STEM offers significant opportunities for understanding the crystallography of intricate biominerals.
  • Parallel data acquisition and automated analysis enhance the throughput for deciphering complex biomineral architectures.