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Crown Mine (McMackin Mine), Custer, Custer District, Custer Co., South Dakota, USA

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Beryl : Be3Al2Si6O18

Crown Mine (McMackin Mine), Custer, Custer District, Custer Co., South Dakota, USA

Beryl crystals to 12.5 cm diameter. South Dakota School of Mines & Technology Museum of Geology. Photograph included in "Mineralogy of the Black Hills (Robert and Rapp, 1965)
 © Stephen E. FritzPhoto ID: 235659    View Count: 38
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