| nickel + silver -f arsenic + bismuth + uranium, and, to mention a rarity, selenium + lead + silver + copper...higher contents of lead and galena, sphalerite, silver, gold, and palladium. I n places of extreme differentiation...deposits the effect is more rapid (Schemnitz, the silver-tin ores of Bolivia). There is no lower temperature...of species in the mineral assemblage. Lead-zinc-silver formation: I n general, galena, sphalerite, chalcopyrite...occur quite consistently. The silver is contained mostly in tetrahedrite, freibergite, and pyrargyrite |
