Mottramite is a rare mineral that primarily consists of lead, copper, and arsenic. It typically forms in hydrothermal veins and is often found in association with other minerals such as malachite and azurite. Its chemical formula is Pb2Cu(AsO4)2(OH)·H2O, and it is known for its distinctive greenish-brown color. This mineral was first discovered in the early 19th century in Mottram in Longdendale, England, which is how it got its name. Mottramite is not commonly used in industry but is of interest to mineral collectors due to its unique properties and rarity.