Summary: A singly terminated transparent, deep-garnet-red crystal originally weighing 1·7g. from a gem gravel from Mogok, Burma, proves to be a new mineral having Al₂O₃ 76·2, SiO₂ 5·6, B₂O₃ 2·2, CaO 15·7, H₂O 0·7, Fe₂O₃ and MnO traces, total 100·4. Sp. gr. 4·01; ω 1·8159, ɛ 1·7875; H 8. The hexagonal unit cell has a 8·725, c 8·46 Å., space group P6₃, P6₃/m or P6₃ 22, and contains approximately 38 O. The name painite is proposed in honour of A. C. D. Pain who recognized the unusual nature of the crystal.