Cu₂Al(AsO₄)(OH)₄.4H₂O

This sample of liroconite is displayed in the Smithsonian Museum of Natural History. Liroconite is an arsenate which contains copper and aluminum with the composition Cu₂Al(AsO₄)(OH)₄.4H₂O. The sample at left is about 5x6 cm and is from Gwennap, Cornwall, England.