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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.
1 Silicon is the eighth most abundant element in the Universe; it is made in stars with a mass of eight or more Earth suns. 2  Near the end of their lives these stars enter the carbon burning phase, adding helium nuclei to carbon to produce oxygen, neon, magnesium and silicon.mpurities in the silicon are about 1 part per billion or less. Isotopes: Silicon has 14 isotopes whose half-lives are known, with mass numbers 22 to 36. Naturally occurring silicon is a mixture of its three stable isotopes and they are found in the percentages shown: 28 Si (92.2%), 29 Si (4.7%) and 30 Si (3.1%).