This Specimen has been sold.
7.1" Petrified Wood (Sequoia) Bookends - Montana
This is a set of petrified wood (Sequoia) bookends from Montana. They are polished on one face to show the striking features of the preserved grain and they are felt lined on two sides to protect surfaces they come in contact with. They vary slightly in size with one bookend measuring 7.1" tall, 4.1" wide and 1.7" thick while the other is 6.9" tall, 4.3" wide, 1.7" thick. These bookends weigh 6.5 lbs total.
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.