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Hoelzel Classification

9 SILICATES

9.C Cyclosilicates

9.CD ~[Si6O18]-rings, without borate

9.CD.1 Zirsinalite-Lovozerite-Subgroup - Cation-saturated members (with occupied B-site)
Zirsinalite Na6(Ca,Mn,Fe2+)ZrSi6O18 trigonal R3m 3m 9.CD.100
Townendite Na8ZrSi6O18 trigonal R3m 3m 9.CD.110
Kapustinite Na5.5Mn0.25ZrSi6O16(OH)2 monoklin C2/m 2/m 9.CD.120
Kazakovite Na6(Mn,H2)TiSi6O18 trigonal R3m 3m 9.CD.140
Combeite Na2Ca2Si3O9 trigonal P3121 32 9.CD.160

9.CD.2 Lovozerite-Subgroup - Cation-defizient members (with vacant B- site)
Lovozerite Na3CaZrSi6O15(OH)3 trigonal R3 3 9.CD.200
Litvinskite Na2(Na,Mn2+)<1Zr[Si6(O,OH)18] monoklin Cm m 9.CD.220
Tisinalite Na3H3(Mn2+,Ca,Fe)TiSi6(O,OH)18·2H2O trigonal P3 3 9.CD.240

9.CD.3 Koashvite-Imandrite-Subgroup
Koashvite Na6(Ca,Mn)(Ti,Fe)Si6O18·H2O orthorhombisch Pmnb mmm 9.CD.300
Imandrite Na12Ca3Fe23+Si12O36 orthorhombisch Pmnn mmm 9.CD.350

9.CD.5 Other structures
Terskite Na4Zr(H4Si6O18) orthorhombisch Pnc2 mm2 9.CD.520
Odintsovite K2(Na,Li)4Ca3Be4Ti4+2[O|Si6O18]2 orthorhombisch Fddd mmm 9.CD.540
Gerenite-(Y) (Ca,Na)2(Y,Ce)3[Si6O18]·2H2O triklin P1 1 9.CD.560

9.CD.6 With other anions
Petarasite Na5Zr2Si6O18(Cl,OH)·2H2O monoklin P21/m 2/m 9.CD.600
Baratovite KCa7(Ti,Zr)2Li3Si12O36F2 monoklin C2/c 2/m 9.CD.620
Aleksandrovite KCa7Sn2Li3Si12O36F2 monoklin C2/c 2/m 9.CD.625
Vyuntspakhkite-(Y) Y(Al,Si)(SiO4)(OH,O)2 monoklin P21/c 2/m 9.CD.640
Traskite Ba21Ca(Fe2+,Mn,Ti)4(Ti,Fe,Mg)12(Si12O36)(Si2O7)6(O,OH)30Cl6·14H2O hexagonal P6m2 6m2 9.CD.660

9.CD.7 Cu-Cyclosilicates - Dioptase-Group
Dioptase CuSiO3·H2O trigonal R3 3 9.CD.700



Mineralsystematik-Übersicht