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n.1.(Min.) A variety of apatite from Wheal Franco in Devonshire.
References in periodicals archive ?
Detailed mapping of just one of the 31 claims has identified outcrops and float of phosphate-rich calcareous sandstone that shows widths of 15-20m, commonly containing visible pellets of francolite (a variety of the phosphorous mineral, Apatite).
Francolite geochemistry--compositional controls during formation, diagenesis, metamorphism and weathering.
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.