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In 1829, German Jewish metallurgist Lewis Feuchtwanger attempted to introduce a metal alloy known as “German silver” into U.S. coinage, promoting this nickel silver as a less-expensive alternative for…
This chart displaying the colors of gems and minerals is from A Popular Treatise on Gems and Minerals by Lewis Feuchtwanger, a German Jewish immigrant to the United States, a doctor who was also well…
