Petrified wood bookends are 6 1/2 inches tall, 12 inches wide, and 2 inches thick. Petrified wood has been around practically since time began. Under specific conditions, the organic materials are replaced by agate, bit by bit, as it decomposes. Sometimes jasper, quartz, and even opal can be found in fossilized wood. Petrified wood is powerful in removing obstacles. Use it to assist in reaching goals that you are having trouble with or to smooth a path for any endeavor that you anticipate will be ridden with difficult barriers. Petrified Wood helps restore physical energy and is good in relieving hip and back problems.