Silicate compounds are minerals that contain silicon and oxygen, often combined with other elements. They are the most abundant group of minerals in the Earth's crust, making up about 90% of it. Common examples include quartz and feldspar, which are essential in the formation of rocks. These compounds are classified into different groups based on their structure, such as nesosilicates, inosilicates, and phyllosilicates. Silicates play a crucial role in various industries, including construction and electronics, due to their durability and thermal stability.