Some of these crystals are 1 cm. Also selenite masses reportedly big as a house filled vugs in the Montreal Mine, and were removed with cross-cut saws. Found within the mines of the zinc-lead district within the county Heyl et. Good specimens are stored in the Milwaukee County Public Museum. The current owners of the cave, Jean and Blaze Cummingham, the two geologists who currently own and operate the cave, could not confirm this report.
Gypsum occurs as micro crystals.
Gypsum is found as an alteration product of pyrite within the St. Peter Formation in the silica sand quarry near Hanover. This association is likely widespread in the state. Gypsum occurs as micro -xls.