33 10 Silicates . Introduction Silicates are compounds that mainly composed of [SiO4 It is the essential components of most rock and soil, such as quartz, feldspar, mica etc§3.10 Silicates ◆ Ⅰ.Introduction Silicates are compounds that mainly composed of [SiO4 ]. It is the essential components of most rock and soil, such as quartz, feldspar, mica etc