Johann Jacob Ferber dating history

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Johann Jacob Ferber (29 August 1743 – April 1790) was a Swedish mineralogist. He came from a family of scientifically inclined pharmacists. He studied natural history with an emphasis on mineralogy at Uppsala University, where Carl Linnaeus was one of his teachers and supervisor of his thesis. After his graduation, Ferber embarked on an international and largely itinerant career. He held the chair in chemistry and natural history of the Academia Petrina in Jelgava 1774–1783, and was professor of mineralogy in Saint Petersburg 1783–1786. He was elected member of the Russian Academy of Sciences and of the Prussian Academy of Sciences. He died in Switzerland in 1790 during one of his many travels.