Igneous rocks, the most widely distributed in the crust, magma is gradually cooled in the depths of the crust into the crystallization of rock, the main component is quartz, feldspar and mica. Usually yellow with pink, and gray. Hard texture, beautiful color, is a good building materials. Known as granite.
Non-toxic only contains a small amount of metal
Granite is a granular crystalline rock, the main component of the ore is alkaline feldspar and quartz. Granite hard texture, difficult to be acid or weathering erosion, often used for building materials.
Granite is a volcanic eruption of lava and subject to considerable pressure in the molten state uplift to the crustal surface of the tectonic rocks. It is also considered to be the result of graniteization caused by deep metamorphism and metasomatism. Many non-ferrous metals such as copper, lead, zinc, tungsten, tin, bismuth, molybdenum, precious metals such as gold, silver, rare metals such as niobium, tantalum, beryllium, radioactive elements such as uranium, thorium, etc., are related to granite. Part of the granite will overflow radon, a natural radioactive gas. Radon can cause lung cancer.
