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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.
Pure silicon oxide is known as mineral quartz which makes up 12% of the crust. There is not a single common non-silicate mineral that contains silicon â silicon always combines with oxygen. Silicate minerals are the building blocks of most common rock types (basalt, granite, schist, gneiss, sandstone, etc.). Carbonate rocks (limestone, dolomite rock) and evaporites (gypsum rock, rock salt) are notable exceptions. They do not contain silicon if they are pure.