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Copper oxalate is a chemical compound. It is has many different uses such as catalyzing organic reactions and stabilizing acetylated polyformaldehyde. Copper oxalate is also fond in seed treatments used to keep away birds and rodents.

Properties
Copper oxalate is usually a blue powder. It is practically insoluble in water, alcohol, ether and acetic acid. It is soluble in ammonium hydroxide. It loses any hydrated water by 200° C. Copper oxalate decomposes in air at 310° C into cupric oxide. It is insoluble in acetone.

Occurrences
A hydrated form of copper oxalate has been found in nature. Moolooite is a rare mineral made of hydrated copper oxalate found in Mooloo Downs station, Western Australia. The oxalate that forms it is thought to come from bird guano. Another occurrence of moolooite has been reported from a silver mining district in France. Copper oxalate has also been found in lichens growing on copper-sulfide rocks.

Production
Copper oxalate is prepared by precipitation from a mixture of a copper(II) salt and sodium oxalate solution.

Hazards
Copper oxalate dust may cause severe irritation of eyes. It may cause moderate to severe irritation of the skin.