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Translucent to transparent yellow cubes of fluorite to 3.5cm on edge forming a matrixless cluster. There are numerous brassy crystals of chalcopyrite to 5 mm in size scattered about these fluorite crystals. From the Mahoning #7 Mine, Cave-in-Rock District, Hardin County, Illinois, USA.
Measures: 5 x 9 x 3 cm
Photo courtesy of Dan and Jill Weinrich