Original Information: 880
Radioactivity in Granite: Its Natural

All rocks have a small amount of radioactivity in them due to the presence of minerals that contain radioactive elements uranium (U), thorium (Th) and potassium-40 (K40). Because granite typically contains more of these elements than most other rocks, it will be more radioactive than a slate or marble. All of the minerals in granite contain some radioelements; the white or pink feldspars contain K40, the black biotites and horn-blendes contain K40, U and Th, and the small inclusions of minerals such as zircon, apatite, sphene, etc. contain the most U and Th.

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Original Information: 880
Radioactivity in Granite: Its Natural

All rocks have a small amount of radioactivity in them due to the presence of minerals that contain radioactive elements uranium (U), thorium (Th) and potassium-40 (K40). Because granite typically contains more of these elements than most other rocks, it will be more radioactive than a slate or marble. All of the minerals in granite contain some radioelements; the white or pink feldspars contain K40, the black biotites and horn-blendes contain K40, U and Th, and the small inclusions of minerals such as zircon, apatite, sphene, etc. contain the most U and Th.

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