1.85" Iridsecent Marcasite with Barite - Iowa

The Linwood Mine has been in operation since 1944: to this day, it ranks as one of the largest limestone mining locations in the United States. On relatively rare occasions, a vug containing minerals will be opened in the mining process, which are then extracted and saved. These vugs often contain beautiful crystal aggregations of calcite, barite, and marcasite, some of which are considered world-class quality specimens.