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Dragline equipment at work, Culbert mine, Upson County, Georgia. Circa 1943. Figure 50, in U.S.Geological Survey Professional paper 248. 1953.
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Ruled mica book in kaolinized pegmatite, Big Bess mine. Gaston County, North Carolina. Figure 32, in U.S.Geological Survey Professional paper 248-A. 1953.
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A structure in large cleavage sheets of muscovite. Typical flat A sheet below; color zoning shows a left edge of sheet above. Southeastern United States. Figure 28, in U.S.Geological Survey Professional paper 248-A. 1953.
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Shaft at the Battery mine, Monroe County, Georgia. Circa 1943. Figure 45, in U.S.Geological Survey Professional paper 248. 1953.
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Typical "A" books of muscovite. Southeastern United States. Figure 29, in U.S.Geological Survey Professional paper 248-A. 1953.
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Triangular lattice of irregular hematite spots in a very thin sheet of mica. Southeastern United States. Figure 38, in U.S.Geological Survey Professional paper 248-A. 1953.
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Irregular contacts between pegmatite and granite, main open-cut of the E.R. Self mine. Gaston County, North Carolina. Circa 1943. Figure 5, in U.S.Geological Survey Professional paper 248-A. 1953.
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Large scale power shovel operations, Big Bess mine, the pegmatite lies nearly flat at the level of the shovel and all the material at higher levels is partly decomposed schist with thin pegmatite stringers. Gaston County, North Carolina. Circa 1943. Figure 51, in U.S.Geological Survey Professional paper 248. 1953.
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Muscovite heavily stained with magnetite and hematite specks. Note the clear areas along the edges of the sheet and along the narrow warps and ripples. Southeastern United States. Figure 35, in U.S.Geological Survey Professional paper 248. 1953.
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Small hexagonal and rhombic muscovite books from the Mitchell Creek pegmatite, note the inclusions of quartz and apatite. Upson County, Georgia. circa 1943. Figure 26, in U.S.Geological Survey Professional paper 248-A. 1953.
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Sharp hanging-wall contact in the main east crosscut of the Knight mine. Note the fine- grained border zone and coarse mica books (dark gray to black) in the wall zone. Rockingham County, North Carolina. circa 1943. Figure 7, in U.S.Geological Survey Professional paper 248. 1953.
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Mica with moderately heavy hematite stain. Southeastern United States. Figure 37, in U.S.Geological Survey Professional paper 248. 1953.
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Mica with heavy blotches and tiny specks of hematite, note the relatively clear margins. Southeastern United States. Figure 39, in U.S.Geological Survey Professional paper 248. 1953.
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Foliated and layered sill of granite (upper light layer) underlain by schist (dark layer), Hawkins mine, the schist is underlain first by layered granite, then by mica bearing pegmatite. Stokes County, North Carolina. circa 1943. Figure 8, in U.S.Geological Survey Professional paper 248. 1953.
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Open-cut work in decomposed pegmatite, White Peak, No. 1 mine, view of the main cut, looking west, the left wall is country rock schist, the right wall massive quartz. Powhatan County, Virginia. Circa 1943. Figure 46, in U.S.Geological Survey Professional paper 248. 1953.
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Large mica books in kaolinized wall zone pegmatite at the White Peak No. 1 mine, Powhatan County, Virginia. Circa 1943. Figure 47, in U.S.Geological Survey Professional paper 248. 1953.
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Radiating group of black tourmaline crystals in a mica book from the Big Bess mine. Gaston County, North Carolina. circa 1943. Figure 40, in U.S.Geological Survey Professional paper 248-A. 1953.
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Abandoned open-cut in hard unweathered rock, Mitchell Creek mine. Upson County, Georgia. Circa 1943. Figure 49, in U.S.Geological Survey Professional paper 248. 1953.
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The same granite sill shown in photo 5: cut by mica-bearing pegmatite (below an to the left). Stokes County, North Carolina. circa 1943. Figure 9, in U.S.Geological Survey Professional paper 248. 1953.
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Mica slightly specked with hematite. The areas of air creep along the trimmed edges of the sheet and along the cracks and hair lines are slightly darker than the areas of clear mica. Southeastern United States. Figure 36, in U.S.Geological Survey Professional paper 248-A. 1953.
map background search result map search result map Irregular contacts between pegmatite and granite, main open-cut of the E.R. Self mine. Gaston County, North Carolina. 1943. Sharp hanging-wall contact in the main east crosscut of the Knight mine. Rockingham County, North Carolina. 1943. Foliated and layered sill of granite underlain by schist, Hawkins mine. Stokes County, North Carolina. 1943. The same granite sill cut by mica-bearing pegmatite. Stokes County, North Carolina. 1943. Small hexagonal and rhombic muscovite books from the Mitchell Creek pegmatite. Upson County, Georgia. 1943. Ruled mica book in kaolinized pegmatite, Big Bess mine. Gaston County, North Carolina. 1953. Radiating group of black tourmaline crystals in a mica book from the Big Bess mine. Gaston County, North Carolina. 1943. Shaft at the Battery mine. Monroe County, Georgia. 1943. Open-cut work in decomposed pegmatite, White Peak, No. 1 mine. Powhatan County, Virginia. 1943. Large mica books in kaolinized wall zone pegmatite at the White Peak No. 1 mine. Powhatan County, Virginia. 1943. Abandoned open-cut in hard unweathered rock, Mitchell Creek mine. Upson County, Georgia. 1943. Dragline equipment at work, Culbert mine. Upson County, Georgia. 1943. Big Bess mine. Gaston County, North Carolina. 1943. Foliated and layered sill of granite underlain by schist, Hawkins mine. Stokes County, North Carolina. 1943. The same granite sill cut by mica-bearing pegmatite. Stokes County, North Carolina. 1943. Small hexagonal and rhombic muscovite books from the Mitchell Creek pegmatite. Upson County, Georgia. 1943. Abandoned open-cut in hard unweathered rock, Mitchell Creek mine. Upson County, Georgia. 1943. Dragline equipment at work, Culbert mine. Upson County, Georgia. 1943. Open-cut work in decomposed pegmatite, White Peak, No. 1 mine. Powhatan County, Virginia. 1943. Large mica books in kaolinized wall zone pegmatite at the White Peak No. 1 mine. Powhatan County, Virginia. 1943. Irregular contacts between pegmatite and granite, main open-cut of the E.R. Self mine. Gaston County, North Carolina. 1943. Ruled mica book in kaolinized pegmatite, Big Bess mine. Gaston County, North Carolina. 1953. Radiating group of black tourmaline crystals in a mica book from the Big Bess mine. Gaston County, North Carolina. 1943. Big Bess mine. Gaston County, North Carolina. 1943. Shaft at the Battery mine. Monroe County, Georgia. 1943. Sharp hanging-wall contact in the main east crosscut of the Knight mine. Rockingham County, North Carolina. 1943.