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About the Role of Fluorine-Bearing Apatite in the Formation of Oxalate Kidney Stones

Crystallography Department, Institute of Earth Sciences, St. Petersburg State University, 7/9, University emb., 199034 St. Petersburg, Russia
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Crystals 2020, 10(6), 486; https://doi.org/10.3390/cryst10060486
Received: 27 April 2020 / Revised: 26 May 2020 / Accepted: 5 June 2020 / Published: 6 June 2020
(This article belongs to the Special Issue Biominerals: Formation, Function, Properties)
Using electron microprobe analysis, 17 kidney stones containing apatite were studied. According to the results of the research, it was found that the apatite of all the oxalate kidney stones contained fluorine, while in the apatite of the phosphate kidney stones, fluorine was present in trace amounts or absent. Direct correlation between the amount of oxalate mineral phases and the fluorine content was observed. Ionic substitutions in the apatite of kidney stones have a multidirectional effect on the unit cell parameters. The fluorine content increases with the increase of a unit cell parameter, which is probably associated with a simultaneous increase in the amount of H2O in the structure of apatite. The results of thermodynamic modeling show that fluorapatite is stable at lower pH values than hydroxylapatite, and therefore can be a precursor of calcium oxalates crystallization. View Full-Text
Keywords: biominerals; kidney stones; pathogen crystallization; X-ray diffraction; calcium oxalates; fluorine; fluorapatite; apatite; nucleation biominerals; kidney stones; pathogen crystallization; X-ray diffraction; calcium oxalates; fluorine; fluorapatite; apatite; nucleation
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Korneev, A.V.; Frank-Kamenetskaya, O.V.; Izatulina, A.R. About the Role of Fluorine-Bearing Apatite in the Formation of Oxalate Kidney Stones. Crystals 2020, 10, 486.

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