Science Advances

Supplementary Materials

This PDF file includes:

  • Fig. S1. (A) SEM images of shell-1 at different magnifications and of different regions. The selected areas are shown in the micrograph. (B) Images of subsurface at different locations after breaking it. (C) Back surface of shell-1.
  • Fig. S2. Micrograph of shell-2 at different magnifications and of different regions. The selected areas are shown in the micrograph. A representative composition spectra showing Ca, C, and O in the sample.
  • Fig. S3. A representative XRD plot of the natural shell. The samples are collected from different locations.
  • Fig. S4. Vickers hardness map of shell-1 and shell-2 showing hardness variation at different locations.
  • Fig. S5. The naturally occurring condition of shell-1 and its nomenclature used in the current work.

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Other Supplementary Material for this manuscript includes the following:

  • Video S1 (.avi format). Stress distribution of the shapes under pressure.

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