Aes magnetica proprietates magnetes validas habet, praesertim cum chalcitis unius magnetis, vanadium titanium, chalcitis, magnetite et oxydatum ferrum mixtum, chalcitis magnetite multi- metallo symbiotico, etc. Magnetes dividitur in granula grossa, particulas minutissimas medias, particulas minutissimas in. magnetite, in quo .. .
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