High Quality Content by WIKIPEDIA articles! The silicate minerals make up the largest and most important class of rock-forming minerals, constituting approximately 90 percent of the crust of the Earth. They are classified based on the structure of their silicate group. Silicate minerals all contain silicon and oxygen.Nesosilicates, or orthosilicates, have isolated (insular) [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.

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