Tree of jade jade of the petrified wood. It is petrified wood, but also because of its crystal clear appearance but different from the ordinary petrified wood. In the long history of the process of land, large tracts of virgin forest is a broad buried in the ground forces of nature. In the high-pressure, low temperature and anaerobic environment, immersed in the silica environment, the trees that carbon dioxide is gradually being replaced, and some of the trees retained some original features, and some mineral elements into the surrounding form the colors of material, which is petrified wood, also known as petrified wood. Then a long geological period, the constant changes in temperature and pressure, the difference occurred in fossil woods metamorphism, Zhongxin crystallization, the main component is converted to opal chalcedony, which is the tree of jade, also called wood of jade.