Silica, a precursor to silicon wafers, makes up about 10% of the Earth's crust by mass [1]. [1] https://onlinelibrary.wiley.com/doi/abs/10.1002/14356007.a23_58

Silica, a precursor to silicon wafers, makes up about 10% of the Earth's crust by mass [1]. [1] https://onlinelibrary.wiley.com/doi/abs/10.1002/14356007.a23_583.pub3 https://onlinelibrary.wiley.com/doi/abs/10.1002/14356007.a23...