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Silicon is the eighth most common element in the universe by mass, but very rarely occurs as the pure element in the Earth's crust. It is most widely distributed in dusts, sands, planetoids, and planets as various forms of silicon dioxide (silica) or silicates.
The silicon to oxygen ratio is 2:7. Silicate minerals containing isolated [Si 2 O 7] 6â double tetrahedrons are called sorosilicates. Silicate Chains. Silicate minerals containing chains are termed inosilicates.