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  1. Any hexagonal or monoclinic pseudohexagonal mineral with the general formula A5 (XO4 )3 (F,Cl,OH) , where A = (Ba,Ca,Ce,K,Na,Pb,Sr,Y) and X = (As,C,P,Si,V). Syn: calcium phosphate
  2. A mineral group fluorapatite, chlorapatite, hydroxylapatite, carbonate-fluorapatite (francolite), and carbonate-hydroxylapatite (dahllite).
    Source: Dictionary of Mining, Mineral, and Related Terms

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