Rhodocrosite Hillman Hall of Minerals and Gems
 
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Fluorite on Sphalerite
Hardin County, Illinois

CM21510 Dark purple cubic crystals of fluorite on stalactitic sphalerite from the Hill-Ledford mine near Cave-In-Rock, Illinois, 16.5 cm tall. Fluorite is a crucial fluxing agent for steel manufacture and untold tons of Illinois fluorite were sent to Pittsburgh for the steel mills. This specimen was purchased from David Crawford in 1987.