Silicate minerals#Nesosilicates or orthosilicates

An island silicates ( nesosilicates ) is referred to silicates, the silicate anions consist of isolated SiO4 tetrahedra, ie, the SiO4 tetrahedra are not connected to each other via Si-O- Si bonds.

At the Department of silicates include the major rock-forming minerals of the garnet and olivine, zircon and the economically or petrological important aluminosilicates andalusite, sillimanite, kyanite and staurolite and topaz.

From the simple structure of the SiO4 complex anion results in no marked directional dependence of the properties of the island silicates. They are often cubic, tetragonal, trigonal, hexagonal or orthorhombic and usually form isometric crystals. The minerals in this department are usually hard and have a high refractive index and a relatively high density.

Olivine

Zircon

Andalusite

Staurolite

Topaz

Classification

In the mineral classification of Liebau the island silicates are just as much as the group ring silicates and silicates to the silicates with the dimensionality 0 The extent of the silicate anions is in any direction (0 dimensions) unlimited.

The Strunz classification assigns the Department of island silicates ( 9.A ) of the chemical environment of the cations in the structure as well as occurrence and type of other anions.

9.AA island silicates without additional anions; Cations in tetrahedraler coordination

  • 9.AA.05 Phenakit Group
  • 9.AA.10 Liberit Group

9.AB island silicates without additional anions; Cations in tetrahedraler and greater coordination

  • 9.AB.05 Trimerit Group
  • 9.AB.10 Larsenit Group
  • 9.AB.15 Esperit Group
  • 9.AB.20 Rondorfit Group

9.AC island silicates without additional anions; Cations in oktahedraler coordination

  • 9.AC.05 Olivine group
  • 9.AC.10 monticellite Group
  • 9.AC.15 Ringwoodite Group

9.AD island silicates without additional anions; Cations in oktahedraler and usually greater coordination

  • 9.AD.05 Larnit Group
  • 9.AD.10 Calcio - Olivine group
  • 9.AD.15 merwinite Group
  • 9.AD.20 bredigite Group
  • 9.AD.25 garnet group
  • 9.AD.30 zircon - group
  • 9.AD.35 huttonite Group
  • 9.AD.40 Eulytin Group
  • 9.AD.45 Reidit Group

9.AE island silicates with additional (O, OH, F, H2O); Cations in tetrahedralrt and usually greater coordination

9.AF island silicates with additional anions; Cations in, and / or only coordination

  • 9.AF.05 sillimanite group
  • 9.AF.10 andalusite group
  • 9.AF.15 kyanite group
  • 9.AF.20 mullite group
  • 9.AF.23 Boromullit
  • 9.AF.25 Yoderit Group
  • 9.AF.30 staurolite Group
  • 9.AF.35 Topaz Group
  • 9.AF.40 norbergite Group
  • 9.AF.45 Chondrodite Group
  • 9.AF.50 Humit Group
  • 9.AF.55 Clinohumite Group
  • 9.AF.60 Leukophönicit Group
  • 9.AF.65 Ribbeit Group
  • 9.AF.70 Jerrygibbsit Group
  • 9.AF.75 Welinit Group
  • 9.AF.80 Ellenbergerit Group
  • 9.AF.85 chloritoid group
  • 9.AF.90 Poldervaartit Group

9.AG island silicates with additional anions; Cations in most cases and > coordination

  • 9.AG.05 Braunite Group
  • 9.AG.15 titanite - group
  • 9.AG.30 Sitinakit Group
  • 9.AG.35 Kittatinnyit Group
  • 9.AG.40 Natisit Group
  • 9.AG.55 Chantalit Group
  • 9.AG.60 Vuagnatit Group
  • 9.AG.65 Hatrurit Group
  • 9.AG.70 Jasmundit Group
  • 9.AG.85 Zoltaiite Group

9.AH island silicates with CO3, SO4, PO4, etc.

  • 9.AH.20 Ternesit Group
  • 9.AH.60 Nagelschmidtit Group

9.AJ island silicates with BO3 triangles and / or B, Be tetrahedra eckenteilend with SiO4

  • 9.AJ.05 Grandidierit Group
  • 9.AJ.10 Dumortierite Group
  • 9.AJ.15 Garrelsit Group
  • 9.AJ.20 Datolith Group
  • 9.AJ.35 Vicanit Group

9.AK uranyl island and layer silicates with U: Si = 2:1

  • 9.AK.05 Soddyit Group
  • 9.AK.10 Sklodowskit Group
  • 9.AK.15 uranophane - group
  • 9.AK.20 Swamboit Group
  • 9.AK.25 Haiweeit Group
  • 9.AK.30 Weeksit Group
  • 9.AK.35 Ursilit Group
  • 9.AK.40 Uranosilit Group
Silicate minerals#Sorosilicates Euclase Datolite Soddyite
413861
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