Calcite on Sphalerite, Sub-Rosiclare Level Deardorff Mine, Ozark-Mahoning Company, Cave-in-Rock District Southern Illinois, Mined c. late 1960s, Dr. Perry & Anne Bynum Collection, Medium Cabinet 4.0 x 6.0 x 10.0 cm, $75. Online 7/24.
Shiny deep brown sphalerite crystals to 2.5 cm with a light druse of straw yellow calcite. Mined c. late 1960s but may be from the early 70s when Minerva did some pillar robbing in the mine. Slight edge rubs on a couple crystals. Massive sphalerite matrix. Dr. H. Perry & Anne Bynum Collection.