This paper provides the complete derivation of quantum mechanics from the spectral geometry of the 600-cell. The Schrödinger equation, the Born rule, Heisenberg uncertainty, and the superposition principle all follow from the structure of the 600-cell adjacency operator acting on coherence below the self-referential threshold. The Born rule P = |ψ|² is derived from the projection measure of the 600-cell's icosahedral symmetry — not postulated. The measurement problem is resolved: wave function differentiation occurs when coherence crosses the threshold at φ⁻¹, with no external observer required.