CaF₂ and CaCO₃ - Mohs Hardness: 4 and 3. Illinois, USA is perhaps best known for world-class fluorites from the Minerva Mine, Denton Mine, and others throughout Hardin County and beyond. Besides colorful fluorites, many other minerals like celestine, galena, sphalerite calcite, and witherite have also been discovered there.
The University of Toledo
Digital Initiatives, University of Toledo Libraries
environmental sciences; virtual exhibitions
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