"This walking cane is millions of years old. This cane is abount as unique as a cane can get. What a conversation piece. Petrified wood is a type of fossil, in which the tissues of a dead plant are replaced with minerals (most often a silicate, such as quartz). The petrifaction process occurs underground, when wood or woody materials suddenly become buried under sediment. Mineral-rich water flowing through the sediment deposits minerals in the plant's cells and as the plant's lignin and cellulose decays away, a stone cast is left in its place."