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• 2009-06-06 12:02 Materialscientist 700×419× (323073 bytes) {{Information |Description = Enargite. Pen for scale. Mineral collection of Bringham Young University Department of Geology, Provo, Utah. Photograph by Andrew Silver. BYU index 3-3004, 3Cu_2S - As_2S_5. |Source = http://libraryphoto.cr.usgs.