Eudialyte group
Encyclopedia
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) = Ca
2+ or Mn
2+ or Fe
2+, M(2) = Fe (both II and III), Mn and rarely Na+, ]+ or Zr
4+, 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. Like other zirconosilicates, the eudialyte group minerals possess alkaline ion-exchange properties, as microporous materials
Na
Na or na may refer to:*Na , a Japanese kana*Na or Mesua ferrea, a species of tree native to Sri Lanka*.na, the top-level domain for Namibia*Na people, a small tribal group in India...
+ and more rarely H3O
Hydronium
In chemistry, a hydronium ion is the cation , a type of oxonium ion produced by protonation of water. This cation is often used to represent the nature of the proton in aqueous solution, where the proton is highly solvated...
+ or H2O
Water
Water is a chemical substance with the chemical formula H2O. A water molecule contains one oxygen and two hydrogen atoms connected by covalent bonds. Water is a liquid at ambient conditions, but it often co-exists on Earth with its solid state, ice, and gaseous state . Water also exists in a...
, N(4) = Na+, Sr2+, Mn2+ and more rarely H3O+ or H2O or K
Potassium
Potassium is the chemical element with the symbol K and atomic number 19. Elemental potassium is a soft silvery-white alkali metal that oxidizes rapidly in air and is very reactive with water, generating sufficient heat to ignite the hydrogen emitted in the reaction.Potassium and sodium are...
+ or Ca2+ or REE3+ (rare earth elements), M(1) and M(1b) = Ca2+, M(1a) = Ca
Calcium
Calcium is the chemical element with the symbol Ca and atomic number 20. It has an atomic mass of 40.078 amu. Calcium is a soft gray alkaline earth metal, and is the fifth-most-abundant element by mass in the Earth's crust...
2+ or Mn
Manganese
Manganese is a chemical element, designated by the symbol Mn. It has the atomic number 25. It is found as a free element in nature , and in many minerals...
2+ or Fe
FE
Fe or FE may refer to:* Iron * Fe , the f-rune of the Younger Futhark* Fe * Fe * "Fe" , a song by Jorge González...
2+, M(2) = Fe (both II and III), Mn and rarely Na+, ]+ or Zr
Zirconium
Zirconium is a chemical element with the symbol Zr and atomic number 40. The name of zirconium is taken from the mineral zircon. Its atomic mass is 91.224. It is a lustrous, grey-white, strong transition metal that resembles titanium...
4+, M(3) = Si
Silicon
Silicon is a chemical element with the symbol Si and atomic number 14. A tetravalent metalloid, it is less reactive than its chemical analog carbon, the nonmetal directly above it in the periodic table, but more reactive than germanium, the metalloid directly below it in the table...
, Nb
Niobium
Niobium or columbium , is a chemical element with the symbol Nb and atomic number 41. It's a soft, grey, ductile transition metal, which is often found in the pyrochlore mineral, the main commercial source for niobium, and columbite...
and rarely W, Ti
Titanium
Titanium is a chemical element with the symbol Ti and atomic number 22. It has a low density and is a strong, lustrous, corrosion-resistant transition metal with a silver color....
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. Like other zirconosilicates, the eudialyte group minerals possess alkaline ion-exchange properties, as microporous materials
List of the eudialyte-group minerals
- AlluaiviteAlluaiviteAlluaivite is an exceedingly rare mineral of the eudialyte group, with complex formula written as Na1963Si26O74Cl·2H2O. It is unique among the eudialyte group as the only titanosilicate . It is named after Mt...
- Na19(Ca,Mn)6(Ti,Nb)3Si26O74Cl.2H2O - Andrianovite - Na12(K,Sr,Ce)3Ca6Mn3Zr3NbSi(Si3O9)2(Si9O27)2O(O,H2O,OH)5
- Aqualite - (H3O)8(Na,K,Sr)5Ca6Zr3Si26O66(OH)9Cl
- Carbokentbrooksite - (Na,□)12(Na,Ce)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3).H2O
- Dualite - Na30(Ca,Na,Ce,Sr)12(Na,Mn,Fe,Ti)6Zr3Ti3Mn(Si51O144)(OH,H2O,Cl)9
- EudialyteEudialyteEudialyte, whose name derives from the Greek phrase Εὖ διάλυτος eu dialytos, meaning "well decomposable", is a somewhat rare, red silicate mineral, which forms in alkaline igneous rocks, such as nepheline syenites...
- Na15Ca6(Fe,Mn)3Zr3(Si3O9)2SiO(Si9O27)2(O,OH,H2O)3(OH,Cl)2 - Feklichevite - Na11Ca9(Fe3+,Fe2+)2Zr3Nb[Si25O73](OH,H2O,Cl,O)5
- Ferrokentbrooksite - Na15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3(Cl,F,OH)2
- Georgbarsanovite - Na12(Mn,Sr,REE)3Ca6Fe3Zr3NbSi25O76Cl2.H2O
- Golyshevite - (Na10Ca3)Ca6Zr3Fe2SiNb(Si3O9)2(Si9O27)2(OH)3(CO3).H2O
- Ikranite - (Na,H3O)15(Ca,Mn)6Fe3+2Zr3-4SiO(Si3O9)2(Si9O27)2.2-3H2O
- Johnsenite-(Ce) - Na12(Ce,La,Sr,Ca)3Ca6Mn3Zr3WSiO(Si3O9)2(Si9O27)2(CO3)(OH,Cl)2.H2O
- Kentbrooksite - (Na,REE)15(Ca,REE)6(Mn,Fe)3Zr3(Si3O9)2SiO(Si9O27)2(O,OH,H2O)3F2.2H2O
- Khomyakovite - Na12Sr3Ca6Fe3Zr3(W,Nb)SiO(Si3O9)2(Si9O27)2(O,OH,H2O)3(OH,Cl)2
- Labyrinthite - (Na,K,Sr)35Ca12Fe3Zr6TiSi51O144(O,OH,H2O)9Cl3
- Manganokhomyakovite - Na12Sr3Ca6Mn3Zr3(W,Nb)SiO(Si3O9)2(Si9O27)2(O,OH,H2O)3(OH,Cl)2
- Mogovidite - Na9(Ca,Na)5Ca6Zr3Fe2(SiNb)(Si3O9)2(Si9O27)2(CO3)(OH,H2O)3Cl0.3
- Oneillite - Na15Ca3Mn3Fe2+3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2
- Raslakite - Na15Ca3Fe2+3(Na,Zr)3Zr3Nb<0.5SiO(Si3O9)2(Si9O27)2(OH,H2O)3(Cl,OH)
- Rastsvetaevite - Na27K8Ca12Fe3Zr6Si52O144(O,OH,H2O)6Cl2
- Taseqite - Na12Sr3Ca6Fe3Zr3NbSiO(Si3O9)2(Si9O27)2(O,OH,H2O)3Cl2
- Voronkovite - Na15(Na,Ca,Ce)3(Mn,Ca)3Fe3Zr3Si26O72(OH,O)4Cl.H2O
- Zirsilite-(Ce) - (Na,□)12(Ce,Na)3Ca6Mn3Zr3Nb(Si25O73)(OH)3(CO3).H2O