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Chemistry Of Rocks And Grinding Stones

2019723 Granite is a natural source of radiation, like most natural stones. Potassium40 is a radioactive isotope of weak emission, and a constituent of alkali feldspar, which in turn is a common component of granitic rocks, more abundant in alkali feldspar granite and syenites. Some granites contain around 10 to 20 parts per million ppm of uranium.

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