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These physical properties are the end result of the processes that formed the rocks. Over the course of time, rocks can transform from one type into another, as described by the geological model called the rock cycle.
These events produce three general classes of rock: igneous, sedimentary, and metamorphic.
Over 90% of the Earth's crust is composed of silicate minerals, making silicon the second most abundant element in the Earth's crust (about 28% by mass) after oxygen.
The outer electron orbital of silicon, like that of carbon, has four valence electrons.
Only 0.6% are syenites and 0.3% peridotites and dunites.
Silicon is a chemical element with symbol Si and atomic number 14.
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It is rather unreactive, though less so than germanium, and has great chemical affinity for oxygen; as such, it was first prepared and characterized in pure form only in 1823 by J? 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.
For example, granite, a common rock, is a combination of the minerals quartz, feldspar and biotite.