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Comb quartz and carbonates: polished section of vein composed of quartz and carbonates, North Star mine No. 2 vein, 8,600-foot level: Opposite saw-cut face of photo 81. Nevada County, California. 1931. Plate 18-A, U.S.Geological Survey Professional paper 194. 1940.
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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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Pinch in quartz vein from 24 to 6 inches, North Star mine, No. 2 vein, 7,200-foot level: Underground photograph of quartz veins. Nevada County, California. 1931. Plate 9-F, U.S.Geological Survey Professional paper 194. 1940.
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Vein containing a single generation of homogeneous quartz, the inclusions rest on the footwall; scale is 6 inches long. North Star mine, North Star vein, 2,700 foot level: Underground photograph of quartz veins. Nevada County, California. 1931. Plate 8-A, U.S.Geological Survey Professional paper 194. 1940.
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Sheeted vein, North Star mine, No. 3 vein, 8,600-foot level: Underground photograph of sheeted veins. Nevada County, California. 1931. Plate 10-B, U.S.Geological Survey Professional paper 194. 1940.
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Comb quartz and carbonates: same section with carbonates dissolved by hydrochloric acid. The quartz shows comb structure and cavities, which existed prior to the introduction of the carbonates. North Star mine No. 2 vein, 8,600-foot level: Opposite saw-cut face of photo 82. Nevada County, California. 1931. Plate 18-A, U.S.Geological Survey Professional paper 194. 1940.
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Brecciated vein filling, North Star mine, A vein 4,000-foot level: Underground photograph of quartz veins. Nevada County, California. 1931. Plate 9-C, U.S.Geological Survey Professional paper 194. 1940.
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Vugs and comb quartz: Polished slab from vug, euhedral quartz crystals are coated with white ankerite. The vug is filled with a dark-green mixture of chlorite and mechanically ground quartz in a matrix of carbonates. Nevada County, California. 1931. Plate 15-B, U.S.Geological Survey Professional paper 194. 1940.
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Strong Walls in granodiorite with interstitial breccia zone: Empire mine, 5,000-foot level. Nevada County, California. 1931. Plate 7-A, U.S.Geological Survey Professional paper 194. 1940.
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Polished slab of granodiorite showing sheeted zone of carbonate veinlets, North Star mine, No. 1 vein, 7,200-foot level: Underground photograph of sheeted veins. Nevada County, California. 1931. Plate 10-A, U.S.Geological Survey Professional paper 194. 1940.
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Album caption: Lassen Naitonal Park, Shasta Co, Calif. 1931. Index card: Lassen National Park. Shasta County, California. 1931.
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Photomicrographs of sheared quartz: irregular granulation with development of mortar structure. North Star mine No. 2 vein, 8,200-foot level. Crossed nicols. Nevada County, California. 1931. Plate 19-C, U.S.Geological Survey Professional paper 194. 1940.
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Photographs of ore: Polished slab showing broken pyrite in vein quartz, North Star mine, No. 1 vein, 8,200-foot level. Nevada County, California. 1931. Plate 11-A, U.S.Geological Survey Professional paper 194. 1940.
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Photographs of ore: polished slab showing sheared quartz with carbonate, cement; North Star mine, No. 3 vein, 9,000-foot level. Nevada County, California. 1931. Plate 11-C, U.S.Geological Survey Professional paper 194. 1940.
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Feather quartz in crossing: Empire mine, 4,000-foot level, short drift on crosscut to X vein. Crossed nicols. Nevada County, California. 1931. Plate 23-B, U.S.Geological Survey Professional paper 194. 1940.
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Sheeted zone at intersection of two veins, North Star mine, No. 2 drift, 8,200-foot level: Underground photograph of sheeted veins. Nevada County, California. 1931. Plate 10- D, U.S.Geological Survey Professional paper 194. 1940.


map background search result map search result map Brecciated vein filling, North Star mine. Nevada County, California. 1931. Vein containing a single generation of homogeneous quartz. Nevada County, California. 1931. Sheeted zone at intersection of two veins, North Star mine, No. 2. Nevada County, California. 1931. Sheeted vein, North Star mine, No. 3 vein. Nevada County, California. 1931. Pinch in quartz vein from 24 to 6 inches, North Star mine, No. 2 vein. Nevada County, California. 1931. Comb quartz and carbonates, North Star mine No. 2 vein. Nevada County, California. 1931. Comb quartz and carbonates, North Star mine No. 2. Nevada County, California. 1931. Polished slab showing broken pyrite in vein quartz, North Star mine, No. 1. Nevada County, California. 1931. Polished slab showing sheared quartz with carbonate, North Star mine, No. 3. Nevada County, California. 1931. Polished slab of granodiorite showing sheeted zone of carbonate veinlets, North Star mine, No. 1. Nevada County, California. 1931. Vugs and comb quartz. Nevada County, California. 1931. Strong Walls in granodiorite with interstitial breccia zone, Empire mine. Nevada County, California. 1931. Photomicrograph showing zoned enclosures and vacuoles, Empire mine. Nevada County, California. 1931. Photomicrographs of sheared quartz, North Star mine. Nevada County, California. 1931. Feather quartz in crossing, Empire mine. Nevada County, California. 1931. Lassen National Park. Shasta County, California. 1931. Lassen National Park. Shasta County, California. 1931. Mt. Lassen. Shasta County, California. 1931. Mt. Lassen. Shasta County, California. 1931. Lassen National Park. Shasta County, California. 1931. Brecciated vein filling, North Star mine. Nevada County, California. 1931. Vein containing a single generation of homogeneous quartz. Nevada County, California. 1931. Sheeted zone at intersection of two veins, North Star mine, No. 2. Nevada County, California. 1931. Sheeted vein, North Star mine, No. 3 vein. Nevada County, California. 1931. Pinch in quartz vein from 24 to 6 inches, North Star mine, No. 2 vein. Nevada County, California. 1931. Comb quartz and carbonates, North Star mine No. 2 vein. Nevada County, California. 1931. Comb quartz and carbonates, North Star mine No. 2. Nevada County, California. 1931. Polished slab showing broken pyrite in vein quartz, North Star mine, No. 1. Nevada County, California. 1931. Polished slab showing sheared quartz with carbonate, North Star mine, No. 3. Nevada County, California. 1931. Polished slab of granodiorite showing sheeted zone of carbonate veinlets, North Star mine, No. 1. Nevada County, California. 1931. Vugs and comb quartz. Nevada County, California. 1931. Strong Walls in granodiorite with interstitial breccia zone, Empire mine. Nevada County, California. 1931. Photomicrograph showing zoned enclosures and vacuoles, Empire mine. Nevada County, California. 1931. Photomicrographs of sheared quartz, North Star mine. Nevada County, California. 1931. Feather quartz in crossing, Empire mine. Nevada County, California. 1931. Lassen National Park. Shasta County, California. 1931. Lassen National Park. Shasta County, California. 1931. Mt. Lassen. Shasta County, California. 1931. Mt. Lassen. Shasta County, California. 1931. Lassen National Park. Shasta County, California. 1931.