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Correct! Apatite can be found in the body, especially in tooth enamel and bones. Apatite refers actually to a group of calcium phosphate minerals with varying content of OH, F, or Cl. In our bodies, we have mostly hydroxyl apatite, Ca5(PO4)3OH. The fluorine added to toothpaste or water can be exchanged against OH in the apatite of the tooth enamel forming Ca5(PO4)3F. The latter is speculated to be slightly stronger. Apatites are also sought after gemstones, best known are peridot and beryl. Depending on the impurities present, beryl is found in various colors, e.g., as green emerald or blue aquamarine.
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