Silicates are chemical compounds comprising silicon, oxygen, and a metal. Most of the earth’s crust is made up of silicates, as is about one-third of the world’s minerals. A silicate’s chemical base is a tetrahedron, a pyramid-shaped molecule with negatively charged ions. Silicates are considered the building blocks of the earth’s crust, appearing in a wide range of forms, including sand, quartz, and gemstone.
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