Gold(I,III) chloride, often represented by the chemical formula AuCl2, is a compound that contains both gold in a +1 oxidation state (Au^+) and gold in a +3 oxidation state (Au^3+). It consists of gold cations (both Au^+ and Au^3+) and chloride anions (Cl^-). This compound represents a mixture of different oxidation states of gold and is not a well-defined chemical species.

Gold compounds with mixed oxidation states can sometimes be encountered due to the ability of gold to exhibit multiple oxidation states in various chemical reactions. However, the precise composition, properties, and behavior of such compounds can be complex and dependent on reaction conditions.