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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.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: California Professional Paper 194,
Johnston, William Drumm Collection,
Mines,
Photographers,
Photomicrographs,
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.
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.
Photomicrograph of polished section. Late fine-grained pyrite deposited contemporaneously with quartz and carbonate that are later than sphalerite and galena. X 60, Wilfley mine. Summit County, Colorado. Circa 1963. Published in US Geological Survey Professional Paper 652, figure 15-C. 1971.
Categories: Image;
Tags: Bergendahl, M.H. Collection,
Colorado Images,
Mines,
Photographers,
Photomicrographs,
Album Caption: Oil shale of the Green River formation. Locality O. Specimen a, Box No.V, Slide No. 16. Place on the slide, ?. Magnification, x215. Subject, filaments, spores, etc. Published in U.S. Geological Survey Professional paper 168, Plate 22, figure 4. 1931.
Categories: Image;
Tags: Davis, C.A. Collection,
Fossils and Dinosaurs,
Photographers,
Photomicrographs,
photo print
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.
Categories: Image;
Tags: Bastin, E.S. Collection,
Photographers,
Photomicrographs,
Professional Paper 104 Nevada,
Professional Papers,
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.
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.
Categories: Image;
Tags: Bastin, E.S. Collection,
Mines,
Photographers,
Photomicrographs,
Professional Paper 104 Nevada,
Photomicrograph of holocrystaline slag. Montana. Plate 3 in U.S. Geological Survey. Professional paper 108. 1918.
Categories: Image;
Tags: Montana Professional Paper 108,
Photographers,
Photomicrographs,
Professional Papers,
Rogers, G.S. Collection,
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.
Categories: Image;
Tags: Bergendahl, M.H. Collection,
Colorado Images,
Mines,
Photographers,
Photomicrographs,
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.
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.
Categories: Image;
Tags: Georgia Professional Paper 224,
Photomicrographs,
Professional Papers,
photo print
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.
Categories: Image;
Tags: Colorado Professional Paper 219,
Mines,
Photomicrographs,
Professional Papers,
photo print
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.
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.
Categories: Image;
Tags: Georgia Professional Paper 224,
Photomicrographs,
Professional Papers,
Rocks,
photo print
Photomicrograph of polished section of pitchblende ore from the Wood Mine, Quartz Hill, Gilpin County, Colorado; showing botryoidal forms characteristic of much of the pitchblende, Py marks pyrite. Plate 2-B, with graphics, in U.S. Geological Survey. Professional paper 90. 1915.
Categories: Image;
Tags: Bastin, E.S. Collection,
Colorado Professional Paper 90,
Mines,
Photographers,
Photomicrographs,
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.
Album Caption: Oil shale of the Green River formation. Locality O. Specimen a, Box No.II, slide No. 9. Place on the slide, 18/46. Magnification, x430. Date of photograph, January 1914. Subject, group of filaments and spores. (Thenamopedium?) Published in U.S. Geological Survey Professional paper 168, Plate 20, figure 5. 1931.
Categories: Image;
Tags: Davis, C.A. Collection,
Fossils and Dinosaurs,
Photographers,
Photomicrographs,
photo print
Photomicrograph of fine-grained metasiltstone from 1 mile southwest of Aubrey Lake: with plain light, showing wedge-shaped and irregular veinlets of orthoclase (white) and laminae of metashale (dark). Bartow County, Georgia. Circa 1944. Plate 10-A, in U.S.Geological Survey Professional paper 224. 1950.
Categories: Image;
Tags: Georgia Professional Paper 224,
Photomicrographs,
Professional Papers,
photo print
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.
Categories: Image;
Tags: Bastin, E.S. Collection,
Mines,
Photographers,
Photomicrographs,
Professional Paper 104 Nevada,
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