Sphalerite and calcite, 5 cm across, Denton mine, Hardin County. Ross Lillie specimen. +!.+!+%% 34!2+ +./8 ...chalcopyrite, and sphalerite, 12.7 cm high, Hardin County. Marv Rausch specimen. 3(%,"9 -!#/50). /5 ....3/. 0/0% (!2$). -!33!# 05,!3+) %8 !. $% 2 Illinois Mineral Locality Index 7)..%"!'/ /',% #!22/...(above). Map showing the counties in Illinois, courtesy the Illinois Geological Survey. 96*2: 405...at 19:53 09 October 2014 T he bedrock under Illinois is predominantly composed of Paleozoic sedimentary |