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. Author manuscript; available in PMC: 2022 Jan 1.
Published in final edited form as: C R Chim. 2021 Jun 29;24(Suppl 2):10.5802/crchim.89. doi: 10.5802/crchim.89

Figure 5.

Figure 5.

Apatite stones most commonly show alternation of X-ray-dense and more lucent layers, and often relatively large X-ray-lucent regions (*). Spectroscopic analysis of X-ray-lucent regions in apatite stones has always shown only apatite, but sometimes with an increase in the protein content of the material. A: A typical apatite stone, pure by spectroscopic analysis. B: An example of the IVa+IIa morphology, with COD crystals between apatite layers. C: An apatite stone that has thin layers of COM at its surface.