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Open AccessArticle

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

1
Shubnikov Institute of Crystallography of Federal Scientific Research Centre “Crystallography and Photonics” of Russian Academy of Sciences, 119333 Moscow, Russia
2
Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, 142432 Moscow, Russia
3
Faculty of Geology, Moscow State University, 119991 Moscow, Russia
4
Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, 119991 Moscow, Russia
5
Independent researcher, Gustav Stresemann-Strasse 34, 74257 Untereisesheim, Germany
6
Institute of Experimental Mineralogy, Russian Academy of Sciences, 142432 Moscow, Russia
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(7), 587; https://doi.org/10.3390/min10070587
Received: 5 June 2020 / Revised: 25 June 2020 / Accepted: 26 June 2020 / Published: 29 June 2020
(This article belongs to the Special Issue Study of the Eudialyte Group Minerals)
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 М2 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.
Keywords: mineral; eudialyte group; crystal structure; isomorphism; infrared spectroscopy; M2 key site; peralkaline rock; Lovozero alkaline complex; Ilímaussaq alkaline complex mineral; eudialyte group; crystal structure; isomorphism; infrared spectroscopy; M2 key site; peralkaline rock; Lovozero alkaline complex; Ilímaussaq alkaline complex
MDPI and ACS Style

Rastsvetaeva, R.K.; Chukanov, N.V.; Pekov, I.V.; Schäfer, C.; Van, K.V. 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. Minerals 2020, 10, 587.

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