francolite


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francolite

[′fraŋ·kə‚līt]
(mineralogy)
Ca5(PO4,CO3)3(F,OH) Colorless fluoride-bearing carbonate-apatite.
References in periodicals archive ?
1999): Francolite as a diagenetic mineral in dinosaur and other Upper Cretaceous reptile bones (Lano, Iberian Peninsula): microstructural, petrological and geochemical features.
RPs from Egypt, Morocco, North Carolina, and Sechura contain francolite (carbonate apatite) as the major apatite mineral, while Queensland and Christmas Island A-ore contain fluorapatite.
The reduction in surface area for the francolite RPs was greatest between 500 and 900 [degrees] C, whereas it occurred between 900 and 1100 [degrees] C for Queensland RP.
Apart from Egyptian RP, the solubility of the apatite RPs became similar for higher calcination temperatures presumably due to fluorapatite replacing the more soluble francolite (Khasawneh and Doll 1978).
Conversion of microcrystalline francolite towards larger crystals of fluorapatite in a sintered mass, as indicated by the increase in UCD a, increased crystal size, and reduced surface area, are responsible for the decrease in relative effectiveness.
The incipient and higher-grade metamorphism is locally found in phosphoritic rocks only, where it is expressed by decarbonization of the original francolite into fluorapatite and recrystallization (Burg et al.