Bayldonite (BAIL-done-ite) is a rare secondary mineral with the chemical formula PbCu₃(AsO₄)₂(OH)₂. It was first discovered in

Penberthy Croft Mine Penberthy Croft Mine, is a disused mine and Site of Special Scientific Interest (SSSI) in Cornwall, England, UK. It is located to the north of the civil parish of St Hilary, east of the town of Penzance. The mine was designated a SSSI in 199 ...

Cornwall Cornwall (; kw, Kernow ) is a historic county and ceremonial county in South West England. It is recognised as one of the Celtic nations, and is the homeland of the Cornish people. Cornwall is bordered to the north and west by the Atlan ...

, England, United Kingdom. It is named after its discoverer, John Bayldon (1837(8) – 1872). Specimens are also found in

Tsumeb , nickname = , settlement_type = City , motto = ''Glück Auf'' (German for ''Good luck'') , image_skyline = Welcome to tsumeb.jpg , imagesize = , image_caption = , image_flag ...

Namibia Namibia (, ), officially the Republic of Namibia, is a country in Southern Africa. Its western border is the Atlantic Ocean. It shares land borders with Zambia and Angola to the north, Botswana to the east and South Africa to the south and e ...

, and

Arizona Arizona ( ; nv, Hoozdo Hahoodzo ; ood, Alĭ ṣonak ) is a U.S. state, state in the Southwestern United States. It is the list of U.S. states and territories by area, 6th largest and the list of U.S. states and territories by population, 14 ...

United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 U.S. state, states, a Washington, D.C., federal district, five ma ...

. It is sometimes used as a gemstone.Gemstones: Properties, Identification and Use By Arthur Thomas, p.159

References

Arsenate minerals Copper minerals Gemstones Monoclinic minerals Minerals in space group 15 {{mineral-stub