This Specimen has been sold.
8.8" Gorgeous, Polished Petrified Wood Stand-up - Washington
This is a gorgeous, 8.8" tall section of petrified wood which has been highly polished to a mirror finish. One edge has been cut flat for presentation purposes. This specimen was a part of an old estate sale in which the location of collection was lost. Based on the rind and color preservation, it's very likely this specimen came from Vantage, Washington, with the possibility of being Saddle Mountain petrified wood.
Petrified wood is the name given to wood that has been turned into stone (fossilized) through the process of permineralization. All of the organic matter becomes replaced by minerals, while much of the original structure such as tree rings in retained. For this to happen the wood needs to be buried in an environment both low in oxygen (preventing decomposition) and with flowing, mineral-laden water. The coloration is due to the various minerals that are present during fossilization. For example red colors are due to iron compounds, greens due to copper, etc.