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granite
Learn about the use of gamma-ray spectroscopy to identify the quarry that was the source of granite found in ancient Roman ruins
Glacial erratic perched on low pedestal of massive granite, Tulare county, Calif. granite: photomicrograph Whaleback outcroppings of Precambrian granite of the basement complex in the Matopo Hills, southwestern Zimbabwe. Saint Cloud Figure 42: Granitic rock consisting of reddish orange feldspar, nearly white quartz, and green epidote that appears to have been introduced into an original quartz-feldspar granite. This rock, sometimes called unakite, is used widely in jewelry.
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Basalt sample returned by Apollo 15, from near a long sinous lunar valley called Hadley Rille. Measured at 3.3 years old.
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Cross section of Earth showing the core, mantle, and crust
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Learn about the use of gamma-ray spectroscopy to identify the quarry that was the source of granite found in ancient Roman ruins
See how gamma-ray spectroscopy is used to identify the quarry that was the source...
Video: Β© Open University (A Britannica Publishing Partner)

Images

granite
Cut and polished surface of granite (magnified 1.5Γ—). Large, slightly pink grains...
D.L. Weide
Glacial erratic perched on low pedestal of massive granite, Tulare county, Calif.
Courtesy of the U.S. Geological Survey, Washington, D.C.
granite: photomicrograph
Photomicrograph of granite in polarized light (magnified 12Γ—).
D.L. Weide
Whaleback outcroppings of Precambrian granite of the basement complex in the Matopo...
Gerald Cubitt
Saint Cloud
Granite quarry at St. Cloud, Minnesota.
Milt and Joan Mann/CameraMann International
Figure 42: Granitic rock consisting of reddish orange feldspar, nearly white quartz,...
Courtesy, Central Michigan University; photo, David L. Brittain
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