Francolite


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Fran´co`lite


n.1.(Min.) A variety of apatite from Wheal Franco in Devonshire.
References in periodicals archive ?
For example, the content of [P.sub.2][O.sub.5] in pure fluor-apatite ([Ca.sub.5][(P[O.sub.4]).sub.3]F) is 42%, and in francolite [([(Ca,Mg,Sr,Na).sub.10](P[O.sub.4],S[O.sub.4],C[O.sub.3]).sub.6][F.sub.2-3]) may be 34%.
Pereda-Suberbiola, "Francolite as a diagenetic mineral in dinosaur and other upper cretaceous reptile bones (lano, iberian peninsula): microstructural, petrological and geochemical features," Cretaceous Research, vol.
According to [41], the phosphate is so-called francolite and the [(C[O.sub.3]).sup.2-] content was estimated at 9.2wt.%.
The phosphorites are of pelletal type and commonly contain cellophane, dahlite, francolite, glaucophane, dolomite, iron oxide and pyrite in various proportions.
Body macrofossils are generally fragmentary, with evidence of dissolution and replacement by calcite and celestite in sponges, dissolution and aragonite-calcite neomorfism processes in corals and molluscs, and replacement by well crystallized francolite (carbonate-fluorapatite) in fossil vertebrates (Astibia et al., 2005; 2014) (Fig.
The ores of Jeroy-Sardarinsky's deposit are characterized with following average mineral composition, %: francolite 56.0; calcite 26.5; quartz 7.5-8.0; hydromica minerals and feldspars 4.0-4.5; gypsum 3.5; goethite 1.0; zeolite - less than 1.0; the organic matter approximately 0.5 (Shinkorenko, Mikhailova, and Levkina, 1989).
Francolite geochemistry--compositional controls during formation, diagenesis, metamorphism and weathering.
The book discusses the geological structure and its component rocks and then describes the different deposits of baddeleyite, apatite, magnetite, vermiculite, francolite, apatite-carbonate ores and carbonatites, summarizing their nature, extent and mining.
The 2 PRs used were highly reactive, being carbonate substituted apatite (francolite) from (i) North Carolina, USA (NCPR), and (ii) Sechura (Bayovar), Peru (SPR).
Petrologically, the vertebrate fossil remains from Lano are composed of well-crystallized francolite (carbonate fluorapatite).