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Electrum showing crystal outlines associated with quartz and sulphides. The argentite was very probably formed by the replacement of galena, but all the other minerals are believed to be alpha hypo gene. Photomicrograph of polished surface of ore from 1,260- foot level, Murray vein, Tonopah Extension mine. Nye County, Nevada. 1915. Plate 5- B, with graphics, in U.S. Geological Survey. Professional paper 104. 1918.
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Banded hypo gene ore: Murray vein, Tonopah Extension mine, just below 950-foot level, one-half natural size. Nye County, Nevada. 1915. Portion is plate 1-B in U.S. Geological Survey. Professional paper 104. 1918.
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Peripheral replacement of galena by an association of argentite and electrum (stippled); note the smoothness of the galena border in passing from contact with argentite to contact with electrum. Photomicrograph of polished surface of ore from 1,250-foot level Murray vein, Tonopah Extension mine. Nye County, Nevada. 1915. Plate 9-B in U.S. Geological Survey. Professional paper 104. 1918.
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Replacement of galena by polybasite; between these two minerals occur narrow bands of an unidentified transition mineral (not visible in the picture), and the very narrow light colored bands that mark the initiation of the replacement process along the contacts between galena crystals consist of this mineral. Photomicrograph of polished surface of ore from Favorite vein, Tonopah-Belmont mine, depth uncertain. Nye County, Nevada. 1915. Plate 7-B, with graphics, in U.S. Geological Survey. Professional paper 104. 1918.
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Supposed hypo gene veinlets of pyrargyrite: the veinlets pass from areas partly altered wall rock to quartz areas and become less well defined in the quartz; natural size, Tonopah Extension mine, exact location uncertain. Nye County, Nevada. 1915. Plates 2-A and B, with graphics, in U.S. Geological Survey. Professional paper 104. 1918.
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Supposed hypo gene veinlets of pyrargyrite: the veinlets pass from areas partly altered wall rock to quartz areas and become less well defined in the quartz; natural size, Tonopah Extension mine, exact location uncertain. Nye County, Nevada. 1915. Plates 2-A and B, with graphics, in U.S. Geological Survey. Professional paper 104. 1918.
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Breccia of quartz and sericitized wall rock partly replace by pyrargyrite; photomicrograph of polished surface of ore. Enlarged 25 diameters. Tonopah Extension mine, exact location uncertain. Nye County, Nevada. 1915. Plate 2-C in U.S. Geological Survey. Professional paper 104. 1918.