Eudialyte group

Eudialyte group is a group of complex trigonal zircono- and, more rarely, titanosilicate minerals with general formula [N(1)N(2)N(3)N(4)N(5)]3[M(1a)M(1b)]3M(2)3M(4)Z3[Si24O72]O'4X2, where N(1) and N(2) and N(3) and N(5) = Na+ and more rarely H3O+ or H2O, N(4) = Na+, Sr2+, Mn2+ and more rarely H3O+ or H2O or K+ or Ca2+ or REE3+ (rare earth elements), M(1) and M(1b) = Ca2+, M(1a) = Ca2+ or Mn2+ or Fe2+, M(2) = Fe (both II and III), Mn and rarely Na+, K+ or Zr4+, M(3) = Si, Nb and rarely W, Ti and [] (vacancy), M(4) = Si and or rarely [], Z Zr4+ and or rarely Ti4+, and X = OH, Cl and more rarely CO32− or F. Some of the eudialyte-like structures can even be more complex, however, in general, its typical feature is the presence of [Si3O9]6− and [Si9O27]18− ring silicate groups.[1] Like other zirconosilicates, the eudialyte group minerals possess alkaline ion-exchange properties, as microporous materials.[2]

List of the eudialyte-group minerals

Further reading

References

  1. Johnsen, O.; Ferraris, G.; Gault, R. A.; Grice, J. D.; Kampf, A. R.; Pekov, I. V. (2003). "The Nomenclature of Eudialyte-Group Minerals". The Canadian Mineralogist 41 (3): 785. doi:10.2113/gscanmin.41.3.785.
  2. Zubkova, Natalia V.; Pushcharovsky, Dmitrii Yu. (2008). "Mixed-Framework Microporous Natural Zirconosilicates : Minerals as Advanced Materials I". p. 45. doi:10.1007/978-3-540-77123-4_6. ISBN 978-3-540-77122-7.

External links