Barite and Fluorite on Sphalerite, Rosiclare Level, Minerva #1 Mine, Ozark-Mahoning Company, Cave-in-Rock District, Southern Illinois, Mined c. 1992, Ron Roberts Collection B-35, Medium Cabinet, 3.5 x 13.0 x 17.5 cm, $350. Online September 14.
Highly recognizable combination from the Minerva #1 ore body consisting of lustrous sphalerite matrix with light bluish-purple fluorite cubes and balls of sparkly white barite. Note: All the barite balls are hollow from dissolution of their cores. In excellent condition. Ex: John and Clara Tolbert Collection of Cave-in-Rock.