Rosiclare

Rosiclare, on the Ohio River in Hardin County, was once "the Fluorspar Capital of the World" — commercial fluorite mining here dates to 1842, and Andrew Jackson himself once owned a fluorspar mine in town.[1] The industry ran until foreign competition, mainly from China, closed the last processing operation in 1996.[1] Rosiclare sits at the heart of the Illinois-Kentucky Fluorspar District, and fluorite — Illinois's state mineral — is still there for the finding: old mine dumps along the Ohio River bluffs produce purple, amber, and blue cubic crystals, and the American Fluorite Museum, built on the old mill site, sits next to a small dump that turns up fluorite, calcite, galena, and sphalerite.[2] Nearby, the former Minerva No. 1 Mine near Cave-in-Rock is another well-known collecting area. Nearly all of this ground is privately owned — permission first.

Rosiclare is in Hardin County, southeastern Illinois, on the Ohio River along IL-146. The American Fluorite Museum sits on the old mill site in town. The former Minerva No. 1 Mine is near Cave-in-Rock, a short drive northeast along the river.

Surface picking through mine dump material and road cuts along the Ohio River bluffs — no digging equipment needed beyond a rock hammer for breaking matrix. At the Minerva No. 1 area, the shafts have reportedly been filled and buildings removed, leaving a gravel field where purple and butterscotch-colored fluorite fragments are common, according to local accounts.[2]

Nearly all mine dumps in this district sit on private land — secure written permission before entering any dump, including the ones near Rosiclare and Cave-in-Rock.[2] One source reports that the Minerva mine's owning company tolerates recreational collectors picking through the filled-in gravel field, but this is an informal, unverified arrangement, not a confirmed public policy — don't treat it as guaranteed access. The American Fluorite Museum is the best starting point for current, confirmed local access information and district history.