Image:Cp--Covellite.jpg

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Photomicrograph: Covellite replacing chalcopyrite, from O.K. and Horn Silver Mines, same specimen as Butler photo 112, enlarged 210 diameters. Utah. 1908. Portion is plate 22-B in U.S. Geological Survey. Professional paper 80. 1913.

URL: http://libraryphoto.cr.usgs.gov/htmllib/btch253/btch253j/btch253z/btch253/bbs00111.jpg

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