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Bayldonite, Tsumeb, Namibia
Category Arsenate minerals
(repeating unit)
Strunz classification 8.BH.45
Crystal system Monoclinic
Crystal class Prismatic (2/m)
(same H-M symbol)
Space group C2/c
Color Green, apple-green
Crystal habit Mammillary crust
Mohs scale hardness
Luster Resinous
Density 5.24–5.65 g/cm3 (measured), 5.707 g/cm3 (calculated)
References [1][2][3]

Bayldonite (BAIL-done-ite)[4] is a rare secondary mineral with the chemical formula PbCu3(AsO4)2(OH)2. It was first discovered in Penberthy Croft Mine, Cornwall, England, United Kingdom.[4] It is named after its discoverer, John Bayldon (1837(8) – 1872).[5] Specimens are also found in Tsumeb, Namibia, and Arizona, United States. It is sometimes used a gemstone.[6]


  1. ^ Mineralienatlas
  2. ^ "Bayldonite Mineral Data". Webmineral. Archived from the original on 7 June 2011. Retrieved 6 June 2011. 
  3. ^ "Bayldonite mineral information and data". Mindat. Retrieved 6 June 2011. 
  4. ^ a b Thomas, Arthur (2008). Gemstones: properties, identification and use. New Holland Publishers. p. 159. ISBN 978-1-84537-602-4. 
  5. ^ A. H. Church: XLI.—Chemical researches on some new and rare cornish minerals. In: Journal of the Chemical Society, 1865, 18, S. 259-268, doi:10.1039/JS8651800259.
  6. ^ Gemstones: Properties, Identification and Use By Arthur Thomas, p.159