It is fossilized wood that has been replaced by chalcedony or silica, meaning the nature of the wood has changed and become a stone version of what it originally was.
Petrified wood is a stone of transformation and change. The stone itself has taken millions of years to become what it is, and these qualities are imparted on the wearer. Patience, respect, reverence for time, aids in releasing worries or fears, is stabilizing and grounding.
Slow & steady growth towards goals. Brings peace in times of change. Helps to gradually strengthen the skeletal body. Connects ancient knowing, & healing ancestral wounds. Aids in past-life recall.