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Nesosilicates or Isosilicates
Nesosilicates (or orthosilicates) have isolated [SiO4]4−
tetrahedra that are connected only by interstitial cations.
Sorosilicates have isolated double tetrahedra groups with (Si2O7)6− or a ratio of 2:7.
Cyclosilicates, ring silicates, have linked tetrahedra with (SixO3x)2x- or a ratio of 1:3. These exists as 3-member (Si3O9)6-, 4-member (Si4O12)8- and 6-member (Si6O18)12- rings.
Inosilicates, chain silicates, have interlocking chains of silicate tetrahedra with either SiO3, 1:3 ratio, for single chains or Si4O11, 4:11 ratio, for double chains.
Single chain inosilicates
Double chain inosilicates
Phyllosilicates, sheet silicates (from Greek φύλλον phyllon, leaf), form parallel sheets of silicate tetrahedra with Si2O5 or a 2:5 ratio.
Tectosilicates, or "framework silicates", have a three-dimensional framework of silicate tetrahedra with SiO2 or a 1:2 ratio. This group comprises nearly 75% of the crust of the Earth. Tectosilicates with the exception of the quartz group are aluminosilicates.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Silicate_minerals". A list of authors is available in Wikipedia.|