Bayldonite

Secondary mineral
4+1⁄2LusterResinous, waxy, greasyStreakSiskin green to apple greenDiaphaneityTransparent, translucentDensity5.24–5.65 g/cm3 (measured), 5.707 g/cm3 (calculated)Optical propertiesBiaxial (+)Refractive indexnα = 1.951 nβ = 1.970 nγ = 1.991Birefringence0.040PleochroismNon-pleochroic2V angle89°Dispersionr < v strongExtinctionY^elongation = 45°; X=bReferences[2][3][4]

Bayldonite (BAIL-done-ite)[5] 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.[5] It is named after its discoverer, John Bayldon (1837(8) – 1872).[6] Specimens are also found in Tsumeb, Namibia, and Arizona, United States. It is sometimes used as a gemstone.[7]

References

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  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ Mineralienatlas
  3. ^ "Bayldonite Mineral Data". Webmineral. Archived from the original on 7 June 2011. Retrieved 6 June 2011.
  4. ^ "Bayldonite mineral information and data". Mindat. Retrieved 6 June 2011.
  5. ^ a b Thomas, Arthur (2008). Gemstones: properties, identification and use. New Holland Publishers. p. 159. ISBN 978-1-84537-602-4.[permanent dead link]
  6. ^ 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.
  7. ^ Gemstones: Properties, Identification and Use By Arthur Thomas, p.159


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