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Radiating intergrowths of quartz (white) and ferruginous rhodochrosite (gray) with small patches of finely divided sulphides (black); photomicrograph (ordinary light) of this thin section of ore from 1000-foot level, Belmont vein. Nye County, Nevada. 1915. Plate 6- A in U.S. Geological Survey. Professional paper 104. 1918.
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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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Example of contact quartz monzonite and altered limestone, Imperial Mine: photomicrograph; quartz monzonite on left, garnetized limestone on right, veinlet crossing slide is composed of quartz, feldspar and magnetite. Ordinary light. Utah. 1908. Plate 10-B, enlarged 30 diameters, in U.S. Geological Survey. Professional paper 80. 1913.
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Photomicrograph: antimonial lead ore, Horn Silver Mine, showing intergrowth of two minerals, possibly galena and antimony mineral. Utah. 1908. Plate 15-B, enlarged 275 diameters, in U.S. Geological Survey. Professional paper 80. 1913.
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Album caption and index card: Photomicrograph of gold-tungsten ore from Keklonga mine, Magnolia district. Sylvanite (s) in vuggy quartz (q3) which contains a little pyrite (py). Quartz (q3) and ferberite (fe) cut in early quartz. Boulder County, Colorado. Notes: Published as figure LXXIV-B in U.S.Geological Survey. Professional Paper 223. 1950.
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Photomicrograph: Typical magnetite ore with fine-grained magnetite (black); replacing diopside, crossed nicols. Magnetite Cliff Jumbo Basin, Prince of Wales Island, Alaska. 1944. Figure 11, in U.S.Geological Survey Professional paper 251. 1953.
Categories: Image; Tags: Photomicrographs, photo print
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Photomicrograph of polished section. Large grains of early pyrite coated with marcasite. Sphalerite and chalcopyrite fill cavity between pyrite grains. X 175, Lucky Strike mine. Summit County, Colorado. Circa 1963. Published in US Geological Survey Professional Paper 652, figure 18-B. 1971.
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Photomicrograph: Fold in fine-grained quartzite; Graphite flakes are oriented parallel to the axial plane of the fold. Plane light. Jumbo Basin, Prince of Wales Island, Alaska. 1944. Figure 3, in U.S.Geological Survey Professional paper 251. 1953.
Categories: Image; Tags: Photomicrographs, photo print
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Photomicrograph of vein rock shown in photo 37, with plain light, showing orthoclase, or, fractured and veined by quartz q. Bartow County, Georgia. Circa 1944. Plate 12-C, in U.S.Geological Survey Professional paper 224. 1950.
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Photomicrograph of polished sections of ore: supergene gold veinlets deposited in fractures in hessite. Surface etched with #1:1 HNO3; large area of white mineral unaffected by acid is coloradoite. Gangue is quartz; reflected light 157 x. Eagle Pass mine. Photo by F.W. Galbraith. La Plata County, Colorado. Circa 1936. Plate 12-D, in U.S.Geological Survey Professional paper 219. 1949.
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Photomicrograph of pseudomorphic quartz and adularia after calcite; from Pick and Shovel mine, 100-foot level. Example of cellular, drusy, radial, and bladed structures characteristic of the Jarbidge veins. Magnified 25 diameters. Elko County, Nevada. 1910. Plate 9 in U.S. Geological Survey. Bulletin 497. 1912.
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Photomicrograph of unweathered oligoclase-mica gneiss from dump at Allatoona gold mine: with plain light showing oligoclase grains clouded with inclusions. Oligoclase, quartz, and orthoclase fill the lighter parts of the field. Other minerals ate intercrystallized micas m; calcite c; apatite a. Bartow County, Georgia. Circa 1944. Plate 6-A, in U.S.Geological Survey Professional paper 224. 1950.
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Photomicrograph showing zoned enclosures and vacuoles: euhedral quartz surrounded by fine-grained ankerite and chlorite. Empire mine, 7,000-foot level. Plain light. Nevada County, California. 1931. Plate 21-D, U.S.Geological Survey Professional paper 194. 1940.
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Photomicrograph: covellite replacing pyrite, Horn Silver Mine; pyrite (light grains) surrounded by covellite (dark material). Beaver County, Utah. 1908. Plate 23-B, enlarged 275 diameters, in U.S. Geological Survey. Professional paper 80. 1913.
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Irregular intergrowth of polybasite, probably alpha hypo gene, with quartz and pyrite; photomicrograph of polished surface of ore just above 500-foot level, West End vein, West End mine. Nye County, Nevada. 1915. Plate 4-A, with graphics, in U.S. Geological Survey. Professional paper 104. 1918.
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Photomicrograph: lean iron ore from Caribou, showing magnetite and ilmenite, augite and serpentine, black areas are magnetite and ilmenite, white areas are serpentine formed by alteration of olivine; some unaltered olivine remains and is gray. Colorado. Circa 1911. Plate 11-C, enlarged 29 diameters, in U.S. Geological Survey. Professional paper 94. 1917.
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Photomicrograph of polished sections of ore: subgraphic pattern of calaverite and sylvanite in hessite, Calaverite, sylvanite and hessite. These textures may indicate replacement of hessite by gold tellurides, but owing to its rarity, such replacement is not believed to be important in La Plata ores. Reflected light 250 x. Gold King mine. Photo by F.W. Galbraith. La Plata County, Colorado. Circa 1936. Plate 10-C, in U.S.Geological Survey Professional paper 219. 1949.
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Album caption and index card: Photomicrograph of gold-tungsten ore from west end of 280-foot level of Keklonga mine, Magnolia district. Sylvanite (s) in crustified quartz (q₁ and q₂) associated with early coarse-grained ferberite. Fine-grained ferberite with a little quartz lies on the earlier quartz and is in turn incrusted and veined by late quartz (q3) containing some ferberite of three generations (f1, f2, and f3). py, Pyrite. Boulder County, Colorado. Notes: Published as figure LXXIV-A in U.S.Geological Survey. Professional Paper 223. 1950.
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Pyrite in matrix of nodule bed. At upper left is the border of relatively large nodule in bed. At lower left is an area clouded with iron oxides. Note small nodules in lower center. Elongated objects lower right are fragments of fish bone in matrix. Enlargement X 40. Smoothed surface photographed in green light. Custer County, South Dakota. circa 1967. (Photomicrograph) Published as figure 9 in U.S. Geological Survey Professional Paper 594-L. 1968.
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Album caption: Bentonite showing volcanic-ash structure. Shows several ringlike areas that represent unbroken glass bubbles, some of them, near the top, with the walls between adjacent bubbles still attached. Also near the top is a plate-like shard that shows perfect orientation of the crystalline clay material. At left center is a shard showing pumice structure. Just below it is a Y-shaped shard, the lower arm of which shows a double row of crystal plates with a dark dividing line. Otay, San Diego County, California. n.d. (Photomicrograph, crossed nicols, X75). (Photo by C.S. Ross). Published as Plate 4-A in U.S. Geological Survey. Professional paper 205-B. 1945.


map background search result map search result map Radiating intergrowths of quartz (white) and ferruginous rhodochrosite (gray) with small patches of finely divided sulphides (black); photomicrograph (ordinary light) of this thin section of ore from 1000-foot level, Belmont vein.  Nye County, Nevada. 1915. Photomicrograph showing zoned enclosures and vacuoles, Empire mine. Nevada County, California. 1931. Gold-tungsten ore from west end of 280-foot level of Keklonga mine. Boulder County, Colorado. 1932. Photomicrograph of gold-tungsten ore from Keklonga mine. Boulder County, Colorado. 1932. Photomicrograph of Antietam quartzite from Strickler anticline; constituents are quartz and albite (white), muscovite (gray) and biotite (black); enlarged 15 X. Pyrite in matrix of nodule bed. Custer County, South Dakota. circa 1967. Pyrite in matrix of nodule bed. Custer County, South Dakota. circa 1967. Photomicrograph showing zoned enclosures and vacuoles, Empire mine. Nevada County, California. 1931. Photomicrograph of Antietam quartzite from Strickler anticline; constituents are quartz and albite (white), muscovite (gray) and biotite (black); enlarged 15 X. Radiating intergrowths of quartz (white) and ferruginous rhodochrosite (gray) with small patches of finely divided sulphides (black); photomicrograph (ordinary light) of this thin section of ore from 1000-foot level, Belmont vein.  Nye County, Nevada. 1915. Gold-tungsten ore from west end of 280-foot level of Keklonga mine. Boulder County, Colorado. 1932. Photomicrograph of gold-tungsten ore from Keklonga mine. Boulder County, Colorado. 1932.