3T polytype of an iron-rich oxyphlogopite from the Bartoy volcanic field, Transbaikalia: Mössbauer, infrared, Raman spectroscopy, and crystal structure.

Autor:	Chukanov, Nikita V., Aksenov, Sergey M., Kasatkin, Anatoly V., Škoda, Radek, Nestola, Fabrizio, Nodari, Luca, Ryanskaya, Anastasia D., Rastsvetaeva, Ramiza K.
Předmět:	RAMAN spectroscopy VOLCANIC fields CRYSTAL structure INFRARED spectra MOSSBAUER spectroscopy FERRITES COORDINATION compounds
Zdroj:	Physics & Chemistry of Minerals; Nov2019, Vol. 46 Issue 10, p899-908, 10p
Abstrakt:	The Mössbauer, infrared and Raman spectra of iron-rich oxyphlogopite from a new locality, the Bartoy occurrence, Transbaikalia, Russia were obtained and its crystal structure was solved. The mineral is characterized by the absence of OH groups and ordered distribution of Fe2+ and Fe3+ between sites having octahedral coordination. Unlike oxyphlogopite holotype sample which is monoclinic (1M polytype), iron-rich oxyphlogopite belongs to the 3T polytype (space group P3112) with the unit-cell parameters a = 5.3248(2) Å, c = 29.788(3) Å, V = 731.44(8) Å3. Its refined crystal-chemical formula is (Z = 3): A(K0.9Na0.1) [M1(Fe2+0.6Mg0.4) M2(Fe3+0.4Ti0.4Mg0.2) M3(Mg0.4Fe3+0.3Ti0.2Al0.1)] [T1,2(Si0.7Al0.3)2O5]2X(O0.9F0.1)2. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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