The Cyclosilicate Subclass
(The Ring Structures)
A subclass of the Silicates



The Cyclosilicates are a small silicate subclass, but an important one. These silicates form chains such as in the inosilicates except that the chains link back around to form rings. The silicon to oxygen ratio is generally the same as the inosilicates, (1:3). The rings can be made of the minimum three tetrahedrons forming triangular rings (such as in Benitoite). Four tetrahedrons can form a rough square shape (such as in Axinite). Six tetrahedrons form hexagonal shapes (such as in Beryl, Cordierite and the Tourmalines). There are even eight membered rings and more complicated ring structures.

The symmetry of the rings usually translates directly to the symmetry of these minerals, at least in the less complex cyclosilicates. Benitoite's ring is a triangle and the symmetry is trigonal or three-fold. Beryl's rings form hexagons and its symmetry is hexagonal or six-fold. The Tourmalines' six membered rings have alternating tetrahedrons pointing up then down producing a trigonal as opposed to an hexagonal symmetry. Axinite's almost total lack of symmetry is due to the complex arrangement of its square rings, triangle shaped borate anions (BO3) and the position of OH groups. Cordierite is pseudo-hexagonal and is analogous to beryl's structure except that aluminums substitute for the silicons in two of the six tetrahedrons.

There are several gemstone minerals represented in this group, a testament to the general high hardness, luster and durability of this subclass.


These are the members of the Cyclosilicate Subclass:

  • Abenakiite-(Ce) (Sodium Cerium Silicate Phosphate Carbonate Sulfite)
  • Alluaivite (Hydrated Sodium Calcium Manganese Titanium Niobium Silicate Hydroxide Chloride)
  • Axinite (Calcium Magnesium Iron Manganese Aluminum Borosilicate Hydroxide)
  • Baotite (Hydrated Barium Titanium Niobium Silicate Chloride)
  • Baratovite (Potassium Lithium Calcium Titanium Zirconium Silicate Fluoride)
  • The Benitoite Group:
    • Bazirite (Barium Zirconim Silicate)
    • Bazzite (Berylium Scandium Aluminum Silicate)
    • Benitoite (Barium Titanium Silicate)
    • Pabstite (Barium Tin Titanium Silicate)
    • Wadeite (Barium Titanium Silicate)
  • Beryl (Berylium Aluminum Silicate)
  • Byelorussite-(Ce) (Hydrated Sodium Barium Cesium Lanthanum Manganese Titanium Silicate Fluoride Hydroxide)
  • Calciohilairite (Hydrated Calcium Zirconium Silicate)
  • Calciumcatapleiite (Hydrated Calcium Zirconium Silicate)
  • Catapleiite (Hydrated Sodium Zirconium Silicate)
  • Combeite (Sodium Calcium Silicate)
  • Cordierite (Magnesium Aluminum Silicate)
  • Dioptase [Copper Silicate Hydroxide]
  • Eudialyte (Sodium Calcium Cesium Iron Manganese Zirconium Silicate Hydroxide Chloride)
  • Foitite (Sodium Iron Aluminum Titanium Silicate Borate Hydroxide)
  • Gaidonnayite (Hydrated Sodium Zirconium Silicate)
  • Georgechaoite (Hydrated Potassium Sodium Zirconium Silicate)
  • Hilairite (Hydrated Sodium Zirconium Silicate)
  • Imandrite (Sodium Calcium Iron Silicate)
  • Indialite (Magnesium Aluminum Silicate)
  • Iraqite-(La) (Potassium Lanthanum Cerium Thorium Caclium Sodium Aluminum Silicate)
  • Jaoquinite (Hydrated Barium Sodium Cesium Titanium Niobium Iron Silicate Hydroxide Fluoride)
  • Jonesite (Hydrated Barium Potassium Sodium Titanium Aluminum Silicate)
  • Kainosite (HydratedCalcium Yttrium Cerium Silicate Carbonate)
  • Kazakovite (Sodium Manganese Titanium Silicate Hydroxide)
  • Koashvite (Hydrated Sodium Calcium Manganese Titanium Iron Silicate)
  • Komkovite (Hydrated Barium Zirconium Silicate)
  • Kostylevite (Hydrated Potassium Zirconium Silicate)
  • Labuntsovite (Hydrated Potassium Barium Sodium Titanium Niobium Aluminum Silicate Oxide Hydroxide)
  • Loudounite (Hydrated Sodium Calcium Zirconium Silicate)
  • Lourenswalsite (Potassium Barium Titanium Magnesium Calcium Iron Aluminum Silicate Hydroxide)
  • Lovozerite (Sodium Calcium Zirconium Titanium Silicate Hydroxide)
  • Margarosanite (Lead Calcium Manganese Silicate)
  • Megacyclite (Hydrated Potassium Sodium Silicate Hydroxide)
  • The Milarite-Osumilite Group:
    • Armenite (Hydrated Barium Calcium Aluminum Silicate)
    • Berezanskite (Potassium Lithium Titanium Silicate)
    • Brannockite (Potassium Antimony Lithium Silicate)
    • Chayesite (Potassium Magnesium Iron Silicate)
    • Darapiosite (Potassium Sodium Lithium Manganese Zinc Zirconium Silicate)
    • Dusmatovite (Potassium Sodium Manganese Yttrium Zirconium Zinc Lithium Silicate)
    • Eifelite (Potassium Sodium Magnesium Silicate)
    • Merrihueite (Potassium Sodium Iron Magnesium Silicate)
    • Milarite (Hydrated Potassium Calcium Aluminum Beryllium Silicate)
    • Osumilite (Potassium Sodium Iron Magnesium Aluminum Silicate)
    • Poudretteite (Potassium Sodium Boron Silicate)
    • Roedderite (Sodium Potassium Magnesium Iron Silicate)
    • Sogdianite (Potassium Sodium Lithium Iron Aluminum Zirconium Silicate)
    • Sugilite (Potassium Sodium Lithium Iron Manganese Aluminum Silicate)
    • Yagiite (Sodium Potassium Magnesium Aluminum Silicate)
  • Muirite (Barium Calcium ManganeseTitanium Silicate Hydroxide Chloride Fluoride)
  • Nagashimalite (Barium Vanadium Titanium Iron Magnesium Boro-silicate Chloride Oxide Hydroxide)
  • Nenadkevichite (Hydrated Sodium Calcium Potassium Niobium Titanium Silicate Oxide Hydroxide)
  • Odintsovite (Potassium Sodium Calcium Titanium Beryllium Silicate)
  • Orthojaoquinite (Hydrated Barium Sodium Cesium Iron Titanium Silicate Oxide Hydroxide)
  • Papagoite (Calcium Copper Aluminum Silicate Hydroxide)
  • Paraumbite (Hydrated Potassium Zirconium Silicate Hydroxide)
  • Petarasite (Sodium Zirconium Silicate Chloride Hydroxide)
  • Roeblingite (Hydrated Lead Calcium Silicate Sulfate Hydroxide)
  • Rossmanite! (Lithium Aluminum Silicate Borate Hydroxide)
  • Sazykinaite-(Y) (Hydrated Sodium Yttrium Zirconium Silicate)
  • Scawtite (Hydrated Calcium Silicate Carbonate Hydroxide)
  • Sekaninaite (Iron Magnesium Aluminum Silicate)
  • Steacyite (Thorium Calcium Sodium Potassium Silicate)
  • Steenstrupine (Hydrated Sodium Cerium Manganese Iron Zirconium Thorium Silicate Phosphate)
  • Strakhovite (Sodium Barium Manganese Silicate Hydroxide)
  • Strontiojaoquinite (Hydrated Strontium Barium Sodium Iron Titanium Silicate Oxide Hydroxide)
  • Strontio-orthojaoquinite (Hydrated Strontium Barium Sodium Iron Titanium Silicate Oxide Hydroxide)
  • Taramellite (Barium Iron Titanium Magnesium Boro-silicate Oxide Chloride)
  • Thorosteenstrupine (Hydrated Calcium Thorium Manganese Silicate)
  • Tienshanite (Barium Sodium Manganese Titanium Boro-silicate)
  • Tisinalite (Sodium Manganese Calcium Iron Titanium Silicate Hydroxide)
  • Titantaramellite (Barium Titanium Iron Magnesium Boro-silicate Oxide Chloride)
  • The Tourmaline Group:
    • Buergerite (Sodium Iron Aluminum Boro-silicate Oxide Fluoride)
    • Chromdravite (Sodium Magnesium Chromium Iron Boro-Silicate Hydroxide)
    • Dravite (Sodium Magnesium Aluminum Boro-Silicate Hydroxide)
    • Elbaite (Sodium Lithium Aluminum Boro-Silicate Hydroxide)
    • Feruvite (Calcium Sodium Iron Magnesium Titanium Aluminum Boro-Silicate Hydroxide)
    • Liddicoatite (Calcium Lithium Aluminum Boro-silicate Hydroxide Fluoride Oxide)
    • Olenite (Sodium Aluminum Boro-Silicate Oxide Hydroxide)
    • Povondraite (Sodium Potassium Iron Magnesium Aluminum Boro-Silicate Hydroxide)
    • Schorl (Sodium Iron Aluminum Boro-Silicate Hydroxide)
    • Uvite (Calcium Sodium Iron Magnesium Aluminum Boro-Silicate Hydroxide)
  • Traskite (Hydrated Barium Iron Titanium Silicate Hydroxide Chloride Fluoride)
  • Umbite (Hydrated Potassium Zirconium Silicate)
  • Walstromite (Barium Calcium Silicate)
  • Zirsinalite (Sodium Calcium Manganese Iron Zirconium Silicate)

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Much information for this page provided by the Mineral Database.

Popular Members of the Silicates Class








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