Stone, sand, and soil for Silicon? No mention of integrated circuits, the single most impactful tech in recent history? Meanwhile, Germanium, gets the semicon

Stone, sand, and soil for Silicon? No mention of integrated circuits, the single most impactful tech in recent history? Meanwhile, Germanium, gets the semiconductor electronics mention. Yes, Germanium is used in certain IC processes, but Silicon has orders of magnitudes more use in semiconductor electronics. Seems like an extremely odd choice to relegate Silicon to nothing more than stone, sand, and soil.