Summary: Creaseyite was first noted in specimens from Tiger, Arizona, and was then found at Wickenburg, Arizona, and Caborca, Sonora, prior to description. It is an oxidezone mineral occurring with wulfenite, willemite, mimetite, chrysocolla, wickenburgite, and ajoite. The composition is [Cu₂Pb₂(Fe,Al)₂Si₅O₁₇·6H₂O]. Colour Agathia green (R.H.S. 142b) with pale streak, H = 2½, Dmeas = 4·1, calc. 4·01. Crystals are orthorhombic with a 12·483, b 21·395, c 7·283. Z = 4. 2V_γ 69° meas; α 1·737, β 1·747, γ 1·768.