silicate sil·i·cate (sĭl'ĭ-kāt', -kĭt)
Any of numerous compounds containing silicon, oxygen, and one or more metals; a salt of silicic acid.
The main minerals found in many rocks. Silicates are composed of atoms of silicon, oxygen, and elements such as potassium, sodium, or calcium, under great heat and pressure. Silicates make up about one-quarter of the crust of the Earth.
Note: Mica and quartz are silicates.