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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.


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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.