On the Isomorphism of Sodium at the M (2) Site in Eudialyte-Group Minerals: The Crystal Structure of Mn-Deficient Manganoeudialyte and the Problem of the Existence of the M (2) Na-Dominant Analogue of Eudialyte

• Published in: Minerals
• Main Authors: Sergey M. Aksenov, Nikita V. Chukanov, Igor V. Pekov, Yulia V. Nelyubina, Dmitry A. Varlamov, Lia N. Kogarko
• Format: Article in Journal/Newspaper
• Language: English
• Published: MDPI AG 2022
• Subjects: eudialyte-group minerals; blocky isomorphism; solid solution; alkaline rocks; manganeudialyte; Mineralogy; QE351-399.2; Kola Peninsula; Lovozero; kola peninsula
• Online Access: https://doi.org/10.3390/min12080949; https://doaj.org/article/cd03299360a348e7a6d98d355ecd9e53

Sodium plays an important role in the crystal structures of eudialyte-group minerals given that it can occupy different crystallographic sites. Predominantly, it distributes between the N (1–5) sites situated in the large cavities of the heteropolyhedral framework. Rarely, Na occupies split sites of...