Journal/NDM60 2026 eng
New Data on Minerals, Volume 60, 2026
DEADLINES FOR ARTICLES
Issue 1 - March 31, 2026
Issue 2 - May 31, 2026
Issue 3 - August 31, 2026
Issue 4 - November 30, 2026
Editorial Board
Editor in Chief:
Plechov P.Yu. -D.Sc. in Geology and Mineralogy, Professor
Members of Editorial Board:
Pekov I.V. - Corresponding Member of the Russian Academy of Sciences
Garanin V.K. - D.Sc. in Geology and Mineralogy, Professor
Borutsky B.E. - D.Sc. in Geology and Mineralogy
Spiridonov B.E. - D.Sc. in Geology and Mineralogy
Chukanov N.V. - D.Sc. in Physical and Mathematical Sciences
Kamenetsky V.S. - Professor (University of Tasmania)
Nenasheva S.N. - PhD in Geology and Mineralogy
Matvienko E.N. - PhD in Geology and Mineralogy
Generalov M.E. - PhD in Geology and Mineralogy
Pautov L.A. - Senior Researcher
Layout Designer
Kronrod E.V. - PhD in Chemistry
Content
Issue 1
Gritsenko Yu.D., Ogorodova L.P., Vyatkin S.V., Vigasina M.F., Plechov P.Yu., Kalinyuk D.A., Ksenofontov D.A., Melchakova L.V.
Investigation of variscite polytypes from the Sary-Sai occurrence, Ulytau region, Kazakhstan, p. 5-18
A physicochemical study of variscite polytypes AlPO4∙2H2O from the Sary-Sai deposit (Ulytau region, Kazakhstan) was conducted using powder X-ray diffraction, electron probe microanalysis, IR, Raman, EPR spectroscopy, and thermogravimetry. The parameters of the rhombic unit cell were determined: for the variscite-1O “Lucin-type” polytype a = 9.8218(17) Å, b = 8.5612(10) Å, c = 9.6278(18) Å and for the variscite-2O “Messbach-type” polytype: a = 9.8971(18) Å, b = 9.664(3) Å, c = 17.184(4) Å. The enthalpy of formation of variscite-2O from elements was determined by high-temperature melt dissolution calorimetry on a Calvet microcalorimeter (–2361.0 ± 4.2 kJ/mol). Its standard entropy was estimated, and its Gibbs energy of formation was calculated (169.5 J/(mol K) and –2129.4 ± 4.2 kJ/mol, respectively).
Keywords: Messbach-type variscite-2O, Lucin-type variscite-1O, polytypes, Sary-Sai occurrence, IR spectroscopy, Raman spectroscopy, EPR spectroscopy, thermogravimetry, Calvet microcalorimetry, enthalpy of formation, entropy, Gibbs energy. читать далее...
