The most abundant group of minerals that contain silicon and oxygen are called

• A. Feldspars
• B. Silicates
• C. Oxides
• D. Sulfates

Answer: (B)

The main idea is that minerals built from silicon and oxygen are the most abundant in Earth's crust. Their defining feature is the silicon-oxygen tetrahedron, SiO4, which can link together in many ways to form a vast family of minerals. Because oxygen is the most plentiful element in the crust and silicon is the next most abundant, silicate minerals dominate rock and mineral composition, making up roughly most of what we find in crustal material. Feldspar is a widespread example, but it’s just one subgroup within the larger silicate family, which also includes quartz, olivine, pyroxenes, amphiboles, and micas. Other mineral groups like oxides or sulfates contain oxygen but not the silicon-oxygen framework that defines silicates, so they’re far less common. That broad, silicon- and oxygen-containing family is why silicates are the correct choice.