Illinois State Mineral


Rough fluorite

Rough fluorite; photo by Rach (balanced.crafts) on Flickr (use permitted with attribution).


Fluorite was designated as the official state mineral of Illinois in 1965. Illinois is the largest producer of fluorite in the United States (the most important deposits are located in southern Illinois at Rosiclare and Cave-in-Rock).

Fluorite is an important industrial mineral (used as a flux in producing steel), and is also used to make hydrofluoric acid (for pottery, optics, and plastics), to make opalescent glass, and in enameling cookware.



Blue fluorite; photo by cobalt123 on Flickr (noncommercial use permitted with attribution / share alike).

Blue fluorite

Tumbled piece of bi-colored fluorite; photo by Jarno (jaja_1985) on Flickr (use permitted with attribution).

Bi-colored fluorite