Rosiclare is a city in Hardin County, Illinois, along the Ohio River. The population was 980 at the 2020 census. Some of the earliest settlers …Rosiclare is a city in Hardin County, Illinois, along the Ohio River. The population was 980 at the 2020 census. Some of the earliest settlers of the Rosiclare area were outlaws mainly counterfeiters from the Sturdivant Gang in the late 1810s-early 1820s. Rosiclare used to be the "Fluorspar Capital of the World". Andrew Jackson, in 1835, once owned a fluorspar mine in Rosiclare. Wholesale mining of fluorspar first began in Rosiclare in 1842. Mining ceased when it became cheaper to import fluorite from China. The Lead and Fluorspar Mining Company continued to process ore from mines in Hardin County but closed due to foreign competition in 1996.
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