Ten Economic Blunders from History
mises.org
mises.org
Your first link is in German (I don't read German).
Your second link mentions nothing about how he managed to fool people into believing he had truly transmuted gold, only that he had done so and was eventually killed for it (which I know for the OP already).
http://translate.google.com/translate?u=http%3A%2F%2Fde.wiki...
I doubt you'll find much more information unless you trawl through the referenced sources.