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The Romance of Silica

Silica forms 60 per cent. by weight of the earth’s crust, and as the Great Architect of the Universe has chosen silica for the frame of this earth, so the structural engineer, in his infinitely humbler capacity, uses it to form about 60 to 70 per cent. of the weight of concrete. E.F. Sargeant

Author(s): Sargeant, E F