Locality: Mahoning No. 1 Mine (Minerva No. 1 Mine), Ozark-Mahoning Group, Cave-in-Rock Sub-District, Illinois - Kentucky Fluorspar District, Hardin County, Illinois, USA (Locality at mindat.org)
This is a fine example of a classic Illinois witherite, in a nice size. While they can be really dull, this one shows a fine luster bouncing off the stepped faces. (Fluorescent LW and SW, white.) 4.9 x 3.7 x 3.2 cm