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- 14:37, 21 June 2026 Cornish semiconductor talk contribs created page Galena (Created page with "* Lustre:Metallic, Sub-Metallic, Dull * Transparency:Opaque * Colour:Lead-grey * Streak:Lead-grey * Hardness:2½ on Mohs scale * Tenacity:Brittle * Cleavage:Perfect {001} * Parting:{111} * Fracture:Sub-Conchoidal [https://www.mindat.org/min-1641.html Data from mindat.org]] The "OG" semiconducting mineral from the early days of radio, galena was chosen as it was the best material for converting radio frequencies into audible signals, by removin...")