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Dehydration processes in borate minerals: pentahydroborite and nifontovite from Fuka Mine, Okayama Prefecture, Japan (CROSBI ID 169256)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Bermanec, Vladimir ; Tomašić, Nenad ; Žigovečki Gobac, Željka ; Rajić Linarić, Maša ; Furić, Krešimir Dehydration processes in borate minerals: pentahydroborite and nifontovite from Fuka Mine, Okayama Prefecture, Japan // Mineralogical magazine, 74 (2010), 6; 1013-1025. doi: 10.1180/minmag.2010.074.6.1013

Podaci o odgovornosti

Bermanec, Vladimir ; Tomašić, Nenad ; Žigovečki Gobac, Željka ; Rajić Linarić, Maša ; Furić, Krešimir

engleski

Dehydration processes in borate minerals: pentahydroborite and nifontovite from Fuka Mine, Okayama Prefecture, Japan

Data on the dehydration of pentahydroborite, CaB2O(OH)6·2H2O and nifontovite, Ca3B6O6(OH)12·2H2O from the Fuka mine, Japan are presented. Critical temperatures of the dehydration of the borates were determined by thermogravimetric analysis/differential thermal analysis measurements. The untreated mineral samples and their heating products were investigated by X-ray diffraction and Raman spectroscopy. Upon dehydration, both minerals decompose and undergo amorphization, and at greater temperatures crystallize as an orthorhombic calcium borate, CaB2O4 (Pnca). The dehydration paths of the two minerals are different, with nifontovite showing a greater resistance to decomposition and amorphization than pentahydroborite. Differences in the dehydration processes are related to the residuals of the water content and structural accommodation of the borate polyanion.

pentahydroborite; nifontovite; calcium borate; thermal decomposition; water content

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Podaci o izdanju

74 (6)

2010.

1013-1025

objavljeno

0026-461X

10.1180/minmag.2010.074.6.1013

Povezanost rada

Fizika, Geologija

Poveznice
Indeksiranost