This Specimen has been sold.
7.3" Free-Standing Petrified Wood (Ash) - McDermitt, OR
This is a very aesthetically pleasing free-standing, petrified wood "sculpture". It's a section of 20 million year old, petrified wood (Ash) from McDermitt, Oregon which has been cut diagonally and polished. It's 7.3 inches tall, 3.5" deep and up to 6.8" wide, weighing about 5 1/2 lbs. The inner wood detail is amazing showing all of the growth rings and the exterior looks almost like it's a still living tree, only it's fossilized.
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.