Petrified wood bookends

Petrified wood is a type of fossilized wood that can form in several different ways. This fossilized wood is normally a preserved section of a tree trunk in which minerals have replaced most, if not all, its organic material (minerals instead of wood). Although petrified wood can consist of different materials other than normal wood, petrified wood can maintain the same shape and patterns as its past organic form. Fossilized wood can also occur in other forms such as wood in submerged forests or mummified wood. What separates petrified wood from other fossilized wood is how it forms.