Osarizawaite is a greenish yellow sulfate mineral with the chemical formula: PbCuAl<sub>2</sub>(SO<sub>4</sub>)<sub>2</sub>(OH)<sub>6</sub>. It has rhombohedral crystals.
It was first described in 1961 for an occurrence in the oxidized zone of the Osarizawa mine, Akita Prefecture, Honshu Island, Japan.