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: Text
• Language: English
• Published: Multidisciplinary Digital Publishing Institute 2022
• Subjects: eudialyte-group minerals; blocky isomorphism; solid solution; alkaline rocks; manganeudialyte; Kola Peninsula; Lovozero; kola peninsula
• Online Access: https://doi.org/10.3390/min12080949

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...