This Specimen has been sold.
Petrified Wood (Chalcedony) From Nevada
This is a petrified tree limb that has been agatised and replaced by a pinkish white Chalcedony. This type of wood is quite famous and known as 'Texas Springs Rose Quartz 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.