Hua'an Jade also called Dargon Painting of Huaan , major components are quartz ,feldspar, diopside , tremolite , actinolite and etc ,  which is recrystallized after silicification .


 It's origin is sea facies sedimentary rocks (about 248 millions years ago ) , 163 millions years ago it changed to calcareous siliceous metamorphic rock due to volcanic eruption .


 It's a kind of stone that doesn’t need pre or after protection , and a rare stone inChina  , we are the legal and sole supplier for this black and white Hua'an Jade in the world .