Decoration materials marble and granite, which radiation?
Is mainly granite in alaskite. Alaskite is late stage magma condensation formation, it is the major constituent of silica (Sio2, i.e., quartz) in the rocks up to 73 - 77%. The stage of the formation of the rock (i.e., the later stage of magma condensation) is also the phase of the relative aggregation of the elements of uranium, thorium, rubidium and potassium. Because of all the elements (including radioactive elements) distributed in the earth are very uneven, if coincided with the distribution of radioactive elements in an area relatively slightly more (known as "geological background high"), the radioactive radiation intensity in the area from alaskite is likely too large.
Granite, of course.In all natural decorative stone, marble, slate, the vast majority of the series (including black, dark blue, dark green and the grey granite series), the radiation intensity is small.Some of the white, red, green, and mottled granite series have a strong radiation intensity:
Because often containing potassium minerals and quartz and other minerals "megaphenocryst", a beautiful porphyritic granite, so its radiation intensity may also have relatively large.From above all, in the light of granite series, only the high area alaskite, potassium feldspar minerals (especially potassium isotope -40 more) granite, zircon bearing minerals (ancient) metamorphic rocks and minerals containing Amazonite granite, it can form the radiation intensity is big and there may be some phenomenon.
The potassium mineral potassium feldspar is the main component of the red granite, while the potassium -40 (40K) is a radioactive element. Therefore, potassium minerals (light pink, pink, etc.), the more likely the radiation intensity (high). In addition, in the red granite, including the granulite and granite gneiss. In this ancient rocks dating back three billion years ago generation, not only containing potassium feldspar, and sometimes with a beautiful color (purple, purple red sauce, etc.) special minerals -- zircon (ZrSiO4). Zircon minerals often mixed with radioactive elements such as uranium and thorium, which makes the red granite more colorful luxury at the same time, along with the radiation intensity also increased, this is the famous "India red" and "South Africa red radiation intensity is too large (high) reason.
