Bologna, Italy/bologna025
Previous | Home | NextHere are various forms of barite: Specimens of various forms of barite, BaSO4. Upper-left: a “tubercule of radiating fibers,” the “Bologna stone.” During the crystallization process, the differentiation has created a core of calcium sulfate and an outer layer of barium sulfate. Lower-left: shards of “Bologna stone” created by the breaking up of the larger stones. Upper-right: most common form of barite, in the form of plates, collected by the authors in Colorado. Lower-right: famous barite roses of Oklahoma, collected by the authors..
