In the course of a long history, large virgin forests were buried underground by vast natural forces. Soaked in a saturated solution of silica under high pressure, low temperature and oxygen-free environment, the carbon in the trees is gradually replaced by silica, and some of the original characteristics of the trees are partially retained, and some mineral elements are included in the surrounding rock. To form a colorful color, this is silicified wood, also known as wood fossil.
After a long geological period, in the constant changes of temperature and pressure, silicified wood has undergone different metamorphism, recrystallization, and the main components are converted into opal chalcedony, which is called tree jade, also known as wood jade.
The specific age of formation, because of the research limitations of silicified wood, has not been fully discovered. The earliest wood fossils to date are fossils of bare fern in the early Carboniferous. The latest is the 65 million years ago in the late Cretaceous silicified wood. It can be determined that the formation period of Muhua jade was between the Paleozoic Carboniferous (starting from 355 million years ago) to the Mesozoic Cretaceous (ending 65 million years ago).
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