Silicon is a chemical element classified as a metalloid, meaning it has properties in between those of metals and nonmetals. It is very common, being the second most abundant element in the Earth's crust. It is also very common in electronics, the chips in your smartphone and computer are made from it. Today, silicon is becoming more and more prevalent in mechanical watches. It is antimagnetic, both harder and lighter than steel, and can be fabricated with nanometer precision. It is the material watchmakers have been dreaming of for centuries.