Silicate minerals#Cyclosilicates

As ring silicates (cyclo silicates ) is called silicates, silicate anions which consist of rings of corner-sharing SiO4 tetrahedra. The rings are isolated, that is, they are not linked to one another via further Si -O bonds to form layers or scaffolds.

At the Department of silicates include major groups of rock-forming minerals such as the tourmaline stones and gems like beryl or benitoite.

The number of silicate tetrahedra in the rings are often reflected in the symmetry of the crystals. Three and six - ring silicates are often trigonal or hexagonal, four - ring silicates often tetragonal or orthorhombic.

Beryl

Tourmaline

Milarite

Eudialyt

Classification

Silicate classification according to Liebau

The structural classification of silicate Liebau divides the cyclo silicates on the basis of the structure of the silicate rings according to the following criteria:

Multiplicity: It indicates how many silicate tetrahedra, the rings are made. Counting only the SiO2 tetrahedra, which are required to close the ring. More tetrahedra which are linked to the ring (branches ) are not counted. The multiplicity of natural ring silicates are usually from 3 to 6, the largest silicate ring found so far of a mineral has a multiplicity of 18 ( Megacyclit ).

Of 4 single ring of Papagoite

6 single ring of beryl

8-seater single ring of Muirit

9er single ring of eudialyte

12er single ring of Traskit

18er single ring of Megacyclit

Multiplicity: It specifies how many rings are linked to one another to form multiple rings. So far, no ring silicates with a multiplicity > 2 are known.

Unbranched foursome double ring of Steacyit

Unbranched double sixes ring of Milarite

Branching: It indicates whether branching from the silicate ring more SiO4 tetrahedra. A distinction is made between open and cyclic branched branched silicates silicates, in which the branching of the chain SiO4 tetrahedra form closed rings.

Open branched secher single ring of Tienshanit

Mixed silicate anions: Some ring silicates contain, besides the silicate ring even more isolated silicate anions. Diversilit - (Ce), for example, contains a silicate triple ring nor a SiO3OH island silicate group Strakhovit a quad ring and a Si2O7 - Gruppensilikatanion.

Strunz

The 9th edition of Strunz 's Mineralogical tables builds on the silicate classification of F. Liebau on and divided the Department of ring silicates (09 C) primarily on the size of the rings ( multiplicity ), then another after the Ringmultiplizität and branching, and finally after the occurrence isolated anion complexes.

9.CA [ Si3O9 ] 6 - three - Simple rings without insular complex [ anions ]

  • 9.CA.05 benitoite Group
  • 9.CA.10 Wadeit Group
  • 9.CA.15
  • 9.CA.20 pseudowollastonite
  • 9.CA.25 Walstromit Group
  • 9.CA.30 Bobtraillit Group

9.CB [ Si3O9 ] 6 - three single rings, with insular complex [ anions ]

  • 9.CB.05 Roeblingit Group
  • 9.CB.10 Diversilit - (Ce)
  • 9.CB.15 Ilímaussit - (Ce)

9.CD [ Si3O9 ] 6 - triple - double rings

  • 9.CD.05 Moskvinit - (Y)

9.CE [ Si4O12 ] 8 - of four - single rings without island-like complex [ anions ]

  • 9.CE.05 Papagoite Group
  • 9.CE.10 Verplanckit Group
  • 9.CE.15 Baotit Group
  • 9.CE.20 Taramellit Group
  • 9.CE.25
  • 9.CE.30 Labuntsovite Group
  • 9.CE.30b Vuoriyarvit -K
  • 9.CE.40 Nenadkevichit Group
  • 9.CE.45 Komarovit Group

9.CF [ Si4O12 ] 8 - foursome single rings, with island style, complex [ anions ]

  • 9.CF.05 Ashburtonit Group
  • 9.CF.10 Kainosit - (Y)
  • 9.CF.15
  • 9.CF.20 Strakhovit Group
  • 9.CF.25 Cerchiarait Group

9.CG [ Si4O12 ] 8 - branched of four single rings

  • 9.CG.05 Eakerit Group

9.CH [ Si4O12 ] 8 - foursome double rings

  • 9.CH.05 Hyalotekit Group
  • 9.CH.10 Steacyit Group

9.CJ [ Si6O18 ] 12 - sixes single rings without insular complex [ anions ]

  • 9.CJ.05 beryl group
  • 9.CJ.10 cordierite - group
  • 9.CJ.15 Lovozerit Group
  • 9.CJ.20 Imandrit Group
  • 9.CJ.25 Baratovit Group
  • 9.CJ.30 Dioptas Group
  • 9.CJ.35 Kostylevit Group
  • 9.CJ.40 Petarasit Group
  • 9.CJ.45: Gerenit - (Y)
  • 9.CJ.50 Odintsovit Group
  • 9.CJ.55 Mathewrogersit Group

9.CK [ Si6O18 ] 12 - sixes single rings, with insular complex [ anions ]

  • 9.CK.05 Tourmaline Group
  • 9.CK.10: Abenakiit - (Ce)
  • 9.CK.15 Scawtite Group
  • 9.CK.20

9.CL [ Si6O18 ] 12 - branched sixes single rings

  • 9.CL.05 Tienshanit Group

9.CM [ Si6O18 ] 12 - sixes double rings

  • 9.CM.05 Milarite Group

9.CN [ Si8O24 ] 16 - eighth -rings

  • 9.CN.05 Muirit Group

9.CO [ Si9O27 ] 18 - neuner -rings

  • 9.CO.10 eudialyte - group

9.CP Twelver and larger rings

  • 9.CP.05 Traskit Group
  • 9.CP.10 Megacyclit Group
Silicate minerals#Sorosilicates Baotite Dioptase List of minerals
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