The mineral apatite and apatite-like compounds are a class of promising inorganic materials, reported to have a wide range of applications including, but not limited to, oxide fuel cells, phosphors, catalysis, and biomaterials. The mineral could be easily tuned via ionic substitutions for enhancement of various optoelectronic properties. In this study we report characterization of natural apatite crystals from different sources using optical spectroscopy, transmission electron microscopy, and X-ray diffraction. We also note roles of external factors such as high pressure and doping with rareearth elements on the optoelectronic properties of the mineral to explore alternate pathways for material synthesis and potential new applications.
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