Carbon dioxide is an essential component of the mineral substances of phosphorites, teeth, bones, etc. The role of carbonate ions has not been given adequate consideration in earlier theories on precipitation of phosphates. Analogies exist between the biochemical precipitation of carbonate apatites, with or without significant amounts of fluorine, and the formation of marine phosphorites. The principles of inorganic chemistry seem to be inadequate to account for phosphorites; various sorts of possible biochemical influences are suggested.

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