Vaterite Crystals Contain Two Interspersed Crystal Structures

@article{KabalahAmitai2013VateriteCC,
  title={Vaterite Crystals Contain Two Interspersed Crystal Structures},
  author={Lee Kabalah-Amitai and Boaz Mayzel and Yaron Kauffmann and Andrew N. Fitch and Leonid Bloch and Pupa U.P.A. Gilbert and Boaz Pokroy},
  journal={Science},
  year={2013},
  volume={340},
  pages={454 - 457}
}
Double Vision Vaterite is the least stable form of anhydrous crystalline calcium carbonate. While rarely found in geological contexts, it is an important biological precursor and occurs as a minor component in the shells of some organisms. The crystal structure of vaterite has long been debated with no model able to explain all the experimentally observed diffraction spots. Kabalah-Amitai et al. (p. 454) show that vaterite contains two coexisting crystallographic structures that form a pseudo… 

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The structure was solved ab initio and described over all the temperature range using a unified modulated structure model in the superspace group C12/c1(α0γ)00 and refined against PEDT data using the dynamical refinement procedure including modulation and twinning as well as against x-ray powder data by the Rietveld refinement.
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