(from the article `mineral`) The silicates can be divided into groups according to structural configuration, which arises from the sharing of one, two, three, or all oxygen ions ... The silicon-oxygen tetrahedrons of the nesosilicates are not polymerized; they are linked to one another only by ionic bonds of the interstitial ... [2 r... Found on http://www.britannica.com/eb/a-z/n/27