We prove that no regular icosahedron in $\mathbb{R}^3$ has a point with rational coordinates on each of its twenty closed faces, in every position, size and orientation, reflections included. This answers a question of I. Bogdanov on MathOverflow. A field automorphism of $\mathbb{C}$ that sends $\sqrt5$ to $-\sqrt5$ reduces the problem to the following statement: for every complex orthogonal $3\times3$ matrix $T$ some real linear combination of $\mathrm{Re}\,T$ and $\mathrm{Im}\,T$ separates ten intervals determined by the faces. We prove this statement by a computer-assisted case analysis over rational parametrizations of rotation frames, in which every inequality is an exact polynomial bound over $\mathbb{Z}[\varphi]$, $\varphi=(1+\sqrt5)/2$; no floating-point arithmetic and no Lipschitz estimates are used. The whole argument, including the $48$ certificates, is formalized in the Lean 4 proof assistant with Mathlib and checked by the Lean kernel; the main theorem depends only on the standard axioms. The mathematical argument and the formalization were produced by AI systems (OpenAI Codex and Anthropic Claude) under the direction of the author; see the statement at the end of the paper.