The carbonate substitution in apatite continues to provoke controversies. In a recent paper, Regnier et al. (1994) challenged the existence of the hypothetical CO3F3– ion in carbonate-fluorapatite (francolite) and concluded that it has reached its demise approximately 55 yr after it was first proposed (Bomeman-Starinkevitch and Belov 1938). Nevertheless, it is necessary to clarify some points before agreeing with all of the paper’s conclusions.

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