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Eudialyte_group

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Eudialyte group is a group of complex trigonal zircono- and, more rarely, titanosilicate minerals with general formula O'4X2, where N(1) and N(2) and N(3) and N(5) = Na + or H2O , N(4) = Na+, Sr2+, Mn2+ and more rarely H3O+ or H2O or K ), M(1) and M(1b) = Ca2+, M(1a) = Ca 2+ or Fe 2+, M(2) = Fe (both II and III), Mn and rarely Na+, K+ or Zr and rarely W ), 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 18− ring silicate groups. Space group is usually R3m or R-3m but may be reduced to R3 due to cation ordering. Like other zirconosilicates, the eudialyte group minerals possess alkaline ion-exchange properties, as microporous materials.

Identification