Calcite with Fluorite, Rosiclare Level, Denton Mine, Ozark-Mahoning Company, Harris Creek District, Southern Illinois, Mined c. early 1980's, Ron Roberts Collection C-4, Small Cabinet 4.5 x 6.5 x 9.5 cm, $100. Online September 14.
Lustrous group of elongated zoned light honey and white, translucent calcite crystals. Crystalized 360 degrees. Basal cleavage shows superlative zoning with smoky gray interior and episodic secondary growths-resembles tree rings. Ex: John and Clara Tolbert Collection of Cave-in-Rock. Classic Denton calcite in excellent condition.