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Siliceous refers to Silica, SiO2 and is generally used to describe the silica content of rocks and other substances. Since this is an important aspect of the classification of rocks, particularly volcanic rocks, the word is widely used in geological and mineralogical circles. The chemical compound silicon dioxide, also known as silica, is the oxide of silicon, chemical formula SiO2. ...
In order to discuss the silicates and their structures it is first necessary to remember that the way atoms are packed together or coordinated by larger anions, like oxygen depends on the radius ratio of the cation to the anion, Rx/Rz.
Thus, this group is often referred to as the island silicate group.
In this case the basic structural group is Si The micas, clayminerals, chlorite, talc, and serpentine minerals are all based on this structure.
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