Petrified Wood, also known as Fossilized Wood has a very unique color and texture. You can stack these rocks on each other, building great mountain scapes. Under water, it becomes a beautiful reddish-yellowish color, which creates a great harmony with any wood and sand decoration. Petrified Wood is a wonderful stone that instantly brings age to an aquarium. It is a type of fossil, formed underground over thousands of years. This stone brings beauty and texture to any aquarium or aquascape. It is as hard and dense as any other stone and it sinks easily. It is very popular with aquascapers, the nature aquarium and Iwagumi.