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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. Granite quarry at St. Cloud, Minnesota. 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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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: © Open University (A Britannica Publishing Partner)

Images

granite
Cut and polished surface of granite (magnified 1.5×). 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 12×).
D.L. Weide
Whaleback outcroppings of Precambrian granite of the basement complex in the Matopo...
Gerald Cubitt
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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