Calcite, attr. Rosiclare Level Minerva #1 Mine, Minerva Oil Company, Cave-in-Rock District, Southern Illinois, Mined c. 1960s, Dr. H. Perry & Anne Bynum Collection, Miniature, 3.5 x 5.5 x 8.0 cm, $225. Online 6/6.
Very lustrous group of calcite showing three stages of crystallization: 1st stage as light brown scalenohedrons, 2nd stage white overgrowth, 3rd stage very lustrous, transparent prismatic crystals oriented parallel to the c-axis. In excellent condition. Mined circa 1960s. Note specimen may be from one of Ozark-Mahoning's mines in the CIR district. Dr. Perry & Anne Bynum Collection.