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Cyclosilicate
SiO4 tetrahedrons share two oxgens at corners each other and form cirlces
Single ring: [(SiO3)3], [(SiO3)4], [(SiO3)6], [(SiO3)8], [(SiO3)12]
Double ring: [(Si2O5)6]
- Single ring: [Si3O9]
- [A(2+)][B][Si3O9] [Hexagonal P(-6)c2] Benitoite group
- Benitoite
- Single ring: [Si6O18]
- [A3][B(3+)2][Si6O18] [Hexagonal P6/mmc]
- Beryl
- Bazzite
- Double ring: [Si12O30]
- [A(+)2][B(2+)2][C(3+)3][Si12O30] [Hexagonal P6/mcc]
- Roedderite
- [A(+)][B(+)2][C(+)3][D(3+)2][Si12O30] [Hexagonal P6/mcc]
- Aluminosugilite
- Sugilite
- [A(+)][][B(+)3][D(4+)2][Si12O30] [Hexagonal P6/mmm]
- Sogdianite
- Hydrate-Cyclosilicate (Double ring)
- [A(+)][B(2+)2][C3][Si12O30],H2O [Hexagonal P6/mcc]
- Milarite
- Hydroxide-Cyclosilicate (Single ring)
- [A(+)][B(2+)7][C2][D(+)3][(OH)2|Si12O36] [Monoclinic C2/c]
- Baratovite
- Chloride-Oxide-Cyclosilicate (Single ring)
- [A(+)15][B(2+)6][C(2+)3][D(4+)][E(4+)][F(4+)3][Cl|O4|(SiO3)2|(Si9O27)2] [Trigonal R(-3)m]
- Eudialyte
- Hydrate-Hydroxide-Oxide-Cyclosilicate (Single ring)
- [A(+)][B(2+)2][C(2+)2][D(2+)][E2][OH|O|Si8O24],H2O [Orthorhombic Ccm2]
- Strontio-orthojoaquinite
- [A(+)][B(2+)2][C(2+)2][D(2+)][E2][OH|O|Si8O24],H2O [Monoclinic C2/m]
- Strontiojoaquinite
- Hydrate-Carbonate-Cyclosilicate (Single ring)
- [A(2+)7][CO3|(Si3O9)2],2H2O [Monoclinic C2/m]
- Scawtite
- [A(2+)2][B(2+)2][CO3|Si4O12],H2O [Orthorhombic Pmnb]
- Kainosite-(Y)
- Hydroxide-Borate-Cyclosilicate (Single ring)
- [A(+)][B(2+)3][C(3+)6][(OH)3|W|(BO3)3|Si6O18] [Trigonal R3m] Tourmaline supergroup
- Dravite
- Elbaite
- Feruvite
- Uvite
- Foitite
- Magnesiofoitite
- Rossmanite
- Schorl
- Tsilaisite
- Oxy-foitite
- Hydroxide-Oxide-Nesoborate-Cyclosilicate (Single ring)
- [A(+)][B(2+)3][C(3+)6][O3|OH|(BO3)3|Si6O18] [Trigonal R3m]
- Olenite
- Hydroxide-Fluoride-Nesoborate-Cyclosilicate (Single ring)
- [A(+)][B(2+)3][C(3+)6][(OH)3|F|(BO3)3|Si6O18] [Trigonal R3m]
- Fluor-elbaite
- Fluor-schorl
- Fluor-dravite
- Fluor-uvite
- Hydroxide-Sorosilicate-Cyclosilicate (Single ring)
- [A(+)][B(2+)3][C(2+)4][(OH)3|Si2O7|Si4O12] [Orthorhombic Pnma]
- Strakhovite
- Hydroxide-Chloride-Oxide-Sorosilicate-Cyclosilicate (Single ring)
- [A(2+)4][B(3+)4][(OH)4|Cl2|O2|Si2O3(OH)4|Si4O12] [Tetragonal I4/mmm]
- Cerchiaraite-(Mn)