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. Space group is usually R3m or R-3m but may be reduced to R3 due to cation ordering.[1] Like other zirconosilicates, the eudialyte group minerals possess alkaline ion-exchange properties, as microporous materials.[2]

List of the eudialyte-group minerals

Approved species
  • Alluaivite - Na19(Ca,Mn)6(Ti,Nb)3Si26O74Cl.2H2O (space group R-3m)
  • Andrianovite - Na12(K,Sr,Ce)3Ca6Mn3Zr3NbSi(Si3O9)2(Si9O27)2O(O,H2O,OH)5 (space group R3m)
  • Aqualite - (H3O)8(Na,K,Sr)5Ca6Zr3Si26O66(OH)9Cl (space group R3)
  • Carbokentbrooksite - (Na,□)12(Na,Ce)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3).H2O (space group R3m)
  • Davinciite - Na12K3Ca6Fe32+Zr3(Si26O73OH)Cl2 (space group R3m)
  • Dualite - Na30(Ca,Na,Ce,Sr)12(Na,Mn,Fe,Ti)6Zr3Ti3Mn(Si51O144)(OH,H2O,Cl)9 (space group R3m)
  • Eudialyte - Na15Ca6(Fe,Mn)3Zr3(Si3O9) 2SiO(Si9O27)2(O,OH,H2O)3(OH,Cl)2 (space group R-3m)
  • Feklichevite - Na11Ca9(Fe3+,Fe2+)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5 (space group R3m)
  • Fengchengite - Na12◻3(Ca,Sr)6Fe33+Zr3Si(Si25O73)(H2O,OH)3(OH,Cl)2 (space group R-3m)
  • Ferrokentbrooksite - Na15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3(Cl,F,OH)2 (space group R3m)
  • Georgbarsanovite - Na12(Mn,Sr,REE)3Ca6Fe3Zr3NbSi25O76Cl2.H2O (space group R3m)
  • Golyshevite - (Na10Ca3)Ca6Zr3Fe2SiNb(Si3O9)2(Si9O27)2(OH)3(CO3).H2O (space group R3m)
  • Ikranite - (Na,H3O)15(Ca,Mn)6Fe3+2Zr3-4SiO(Si3O9)2(Si9O27)2.2-3H2O (space group R3m)
  • Ilyukhinite (H3O,Na)14Ca6Mn2Zr3Si26O72(OH)2·3H2O - the most recent add (space group R3m)[3]
  • Johnsenite-(Ce) - Na12(Ce,La,Sr,Ca)3Ca6Mn3Zr3WSiO(Si3O9)2(Si9O27)2(CO3)(OH,Cl)2.H2O (space group R3m)
  • Kentbrooksite - (Na,REE)15(Ca,REE)6(Mn,Fe)3Zr3(Si3O9)2SiO(Si9O27)2(O,OH,H2O)3F2.2H2O (space group R3m)
  • Khomyakovite - Na12Sr3Ca6Fe3Zr3(W,Nb)SiO(Si3O9)2(Si9O27)2(O,OH,H2O)3(OH,Cl)2 (space group R3m)
  • Labyrinthite - (Na,K,Sr)35Ca12Fe3Zr6TiSi51O144(O,OH,H2O)9Cl3 (space group R3)
  • Manganokhomyakovite - Na12Sr3Ca6Mn3Zr3(W,Nb)SiO(Si3O9)2(Si9O27)2(O,OH,H2O)3(OH,Cl)2 (space group R3m)
  • Manganoeudialyte - Na14Ca6Mn3Zr3[Si26O72(OH)2]Cl2.4H2O (space group R3m)
  • Mogovidite - Na9(Ca,Na)5Ca6Zr3Fe2(SiNb)(Si3O9)2(Si9O27)2(CO3)(OH,H2O)3Cl0.3 (space group R3m)
  • Oneillite - Na15Ca3Mn3Fe2+3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2 (space group R3)
  • Raslakite - Na15Ca3Fe2+3(Na,Zr)3Zr3Nb<0.5SiO(Si3O9)2(Si9O27)2(OH,H2O)3(Cl,OH) (space group R3)
  • Rastsvetaevite - Na27K8Ca12Fe3Zr6Si52O144(O,OH,H2O)6Cl2 (space group R3m)
  • Taseqite - Na12Sr3Ca6Fe3Zr3NbSiO(Si3O9)2(Si9O27)2(O,OH,H2O)3Cl2 (space group R3m)
  • Voronkovite - Na15(Na,Ca,Ce)3(Mn,Ca)3Fe3Zr3Si26O72(OH,O)4Cl.H2O (space group R3)
  • Zirsilite-(Ce) - (Na,□)12(Ce,Na)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3).H2O (space group R3m)

Unnamed species

The list of eudialyte-related natural phases is growing. There are many such phases, some of them very complex, coded "UM" by the International Mineralogical Association, and include:[4][5]

  • UM-1971-22-SiO:CaClFeHMgMnNaNbZr - Na12Ca5(Ce,La,Y,Ca)Zr3(Zr,Nb)(Fe,Mn)3[Si9O24-26(OH)1-3]2(Si3O9)2Cl - with variable substitution of OH for oxygen
  • UM1990-79-SiO:CaClFeHMnNaNbREEZr - Na14Ca5(Mg,Ca,Mn)Zr3(Si3O9)2(Si9O27)2(Si,Nb,Al,Zr)2(Fe,Zr)3(Mn,Na,Ce,La,Y)(Na,H2O,K,Sr)(OH)4-5(OH,Cl) - first representative with magnesium-dominant site
  • UM1990-80- SiO:CaFeHMnNaNbREEZr - Na14Ca4(Mn,Ca)2Zr3(Si3O9)2(Si9O27)2(Si,Nb,Al,Zr)2(Fe,Mn,Al,Ti)3(Na,Ce,La,Y,Mn)(Na,H2O,K,Sr)(OH)7-8
  • UM1998-21-SiO:CaCeClHMnNaZr - Na16Ca6(Mn,Ce)3Zr3(Si3O9)2(Si9O27)2(OH,Cl)4
  • UM1999-36-SiO:CaCeHMnNaNbSrZr - Na17Mn3Ca2Zr3Si26O72(OH,F,Cl)4
  • UM2000-66-SiO:CaClFeHMnNaNbSrZr - Na12(Ca,Mn)6(Sr,Na,K)3(Fe,Mn)3(Zr,Nb)4Si25O66(OH,Cl)11
  • UM2003-39- SiO:CaClFeHHfNaNbSrTaTiZr - Na12(Na,K,Mn,Sr)2Ca5(Ca,Mn)(Zr,Hf)3(Fe,[],Ta)3(Si,Nb,W)(Si,Al,Ti)Si24O72(OH,O)33.5Cl•1.2H2O
  • UM2004-51-SiO:CaClFFeHNaNbTi' - Na16Ca6(Fe,Mn)3Zr3(Ti,Nb)Si26O72FCl0.5•nH2O
  • UM2006-17-SiO:CaClFFeHMnNaZr - Na15(Ca3Mn3)Zr3(Fe,Zr)3SiSi(Si3O9)2(Si9O27)2O2(OH,F,Cl)3•2H2O
  • UM2006-18-SiO:CaClFFeHMnNaZr - Na15Ca3(Mn,Fe)3Zr3(Zr,Na)3(Si,Nb)(S,Ti,Si)(Si3O9)2(Si9O27)2(O,OH)5(Cl,F,H2O) - with essential sulfur and with Zr dominant in two sites
  • UM2006-28-SiO:CaHMnNaZr - Na33Ca12Zr6Mn3(Mn,Nb,Ti)2Si50O132(O,OH)12(OH,H2O,Cl)10 - with double c unit cell dimension

In addition, there is "eudialyte 3248": Na29Ca12Zr6[Si48O132(O,OH)12]{[Na]4[Si]2}{[Mn]3[Mn,Nb,Ti]2}(OH,H2O,Cl)10, plus admixtures of Ce, Sr, Ba and Y, characterized by one S-dominant site (not shown in the simplified formula)[6]

Other species

Rastsvetaeva et al. (2015) describe a species tentatively called "hydrorastsvetaevite", with a formula (Na11(H3O)11K6(H2O)1.5Sr)Ca12Fe3Na2MnZr6Si52O144(OH)4.5Cl3.5.[7]

Further reading
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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): 785–794. 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. pp. 45–56. doi:10.1007/978-3-540-77123-4_6. ISBN 978-3-540-77122-7.
  3. Hålenius, U.; Hatert, F.; Pasero, M.; Mills, S. J. (2015). "New minerals and nomenclature modifications approved in 2015". Mineralogical Magazine. 79 (7): 1859–1864. doi:10.1180/minmag.2015.079.7.18.
  4. Mindat, www.mindat.org
  5. Smith, D.G.W., and Nickel, E.H.N., 2007. A System of Codification for Unnamed Minerals: Report of the SubCommittee for Unnamed Minerals of the IMA Commission on New Minerals, Nomenclature and Classification. Canadian Mineralogist v. 45, p.983-1055; http://nrmima.nrm.se/Valid2012.pdf
  6. Rastsvetaeva et al. 2006, in: Ercit et al. 2007, https://link.springer.com/article/10.1134/S1028334X06070166
  7. Rastsvetaeva, R. K.; Aksenov, S. M.; Rozenberg, K. A. (2015). "Crystal structure and genesis of the hydrated analog of rastsvetaevite". Crystallography Reports. 60 (6): 831–840. Bibcode:2015CryRp..60..831R. doi:10.1134/S1063774515060279.
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