... G3576 is its code in Unified catalogue for natural stone of China . So it's classify as a granite ... . It's a kind of stone that doesn’t need pre or after protection ... 06%Porosity:0.12%Polish degree100Radiation Intensity Grade A stone quarry No water , No oil absorption ,neither ... stones for “Chinese Famous National Stone” ,Jade ingredients , non-renewable ,one of the most famous rare stones ...