"Johan Gottlieb Gahn (August 19, 1745 \u2013 December 8, 1818) was a Swedish chemist and metallurgist who discovered manganese in 1774.Gahn studied in Uppsala 1762 \u2013 1770 and became acquainted with chemists Torbern Bergman and Carl Wilhelm Scheele."@en . . "1745-08-19Z"^^ . . . "Gahn, Johan Gottlieb"@en . . . "Johan Gottlieb Gahn"@en . . . "1818-12-08Z"^^ . "1818Z"^^ . "Swedish chemist" . "1745Z"^^ .