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Fluorite on sphalerite, 30 cm, from the Rosiclare level, Cross-Cut orebody, Minerva #1 mine, Hardin County, Illinois. The voids may be the result of the dissolution of a layer of barite between the sphalerite and fluorite. Photo by Jeff Scovil.
A collector's guide to Minerva No. 1 Mine, USA: its geology, mining history and notable minerals, illustrated with the 725 specimens documented from this locality on EarthWonders.
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