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- Published: 2009-06-02
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- Author: eHow
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==Cyclosilicates== Cyclosilicates, or ring silicates, have linked tetrahedra with (SixO3x)2x- or a ratio of 1:3. These exist as 3-member (Si3O9)6-, 4-member (Si4O12)8- and 6-member (Si6O18)12- rings.
==Phyllosilicates== Phyllosilicates (from Greek φύλλον phyllon, leaf), or sheet silicates, form parallel sheets of silicate tetrahedra with Si2O5 or a 2:5 ratio.
Ferroan Anorthosite #60025 (Plagioclase Feldspar). Collected by Apollo 16 from the Lunar Highlands near Descartes Crater. ]]
*Quartz group
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*Mindat.org, Dana classification
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