Some people say that natural stone radiation is very powerful. Is that true?
Natural stone really have radiation (marble for example) and stone radiation levels are divided into three categories: a minimum of B radiation, followed by C, the biggest, but a choice for indoor use is no problem, and don't try to choose bright colors of marble. The marble granite radiation than the strong, so can not vote on the election.
In general, there is a texture, known as marble, to the point of the main spots known as granite. This is broadly speaking. In a narrow sense, marble refers to the stone produced in Yunnan, Dali.
Natural stone in daily use is mainly divided into two kinds: marble and granite
