Antlerite is a greenish hydrous copper sulfate mineral, with the formula Cu3(SO4)(OH)4.

It occurs in tabular, acicular, or fibrous crystals with a vitreous luster.

It is chemically and optically similar in many respects to other copper minerals such as malachite and brochantite, though it can be distinguished from the former by a lack of effervescence in hydrochloric acid.

Antlerite is a common corrosion product on bronze sculptures located in urban areas, where atmospheric sulfur dioxide (a common pollutant) is present.

Antlerite forms mainly in sheltered areas where weathering is low, which permits accumulation of copper ions and enhancement in the acidity of water films.