What does 664# granite mean?
2. Granite is a kind of tectonic rock formed when lava erupted by volcano rises to the surface of the earth's crust in a molten state under considerable pressure. Magma does not gush out from underground, but slowly cools and solidifies underground. It is a kind of deep acid igneous rock, belonging to igneous rock. Granite is mainly composed of quartz, feldspar and mica. Among them, the content of feldspar is 40%-60%, and the timely content is 20%-40%, and its color depends on the type and quantity of components. This rock is hard and dense.
3. Granite is acidic rock with high silicon content. Some granites contain trace radioactive elements, so indoor use should be avoided. Granite has compact structure, hard texture, good acid and alkali resistance and weather resistance, and can be used outdoors for a long time.