New Data on the Isomorphism in Eudialyte-Group Minerals. 1. Crystal Chemistry of Eudialyte-Group Members with Na Incorporated into the Framework as a Marker of Hyperagpaitic Conditions

Autor:	Ramiza K. Rastsvetaeva, Nikita V. Chukanov, Igor V. Pekov, Christof Schäfer, Konstantin V. Van
Jazyk:	angličtina
Rok vydání:	2020
Předmět:	mineral eudialyte group crystal structure isomorphism infrared spectroscopy M2 key site Mineralogy QE351-399.2
Zdroj:	Minerals, Vol 10, Iss 7, p 587 (2020)
Druh dokumentu:	article
ISSN:	2075-163X
DOI:	10.3390/min10070587
Popis:	A review of the crystal chemistry of Fe-deficient eudialyte-group minerals is given. Specific features of cation distribution over key sites in the crystal structure, including partial substitution of Fe2+ with Na, Mn and Zr at the M2 site are discussed. It is concluded that Na-dominant (at the M2 site) eudialyte-group members (M2Na-EGMs) are markers of specific kinds of specific peralkaline (hyperagpaitic) igneous rocks and pegmatites. New data are obtained on the chemical composition, IR spectra and crystal chemistry for two samples of M2Na-EGMs with disordered M1 cations, which are a potentially new mineral species with the simplified formula (Na,H2O)15Ca6Zr3[Na2(Fe,Zr)][Si26O72](OH)2Cl·nH2O.
Databáze:	Directory of Open Access Journals
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