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Madoc is a little mine in northern Ontario that, sporadically, produces fluorite crystals that sometimes get up to the size of baseballs. Usually they are pale and etched, and often the luster is lost in the process of dissolving them out of the barite that has filled many cavities there. But these crystals have a deep green hue and the cuboctohedra measure to 1.5 cm across and are transparent and gemmy. The pyrite dusting makes for a very attractive contrast. From the Madoc Mine, Madoc, Ontario, Canada.
Measures: 7 cm across
Photo courtesy of The Arkenstone