Petrifaction, one kind of fossilization, occurs when chemical changes cause a mineral to grow, grain by grain, in place of the original tissues of the animal or plant. Growth rings, like those that can be seen in the wood of trees living today, show clearly in those polished surfaces of petrified wood. They provide useful information about the seasonal growth of those trees, and the climate at the time those trees were living.  

it is now thought that it takes place through a process known as infiltration. As the sediment water, rich in minerals, seeped into the wood, it deposited the minerals in the air spaces within the wood tissues until all of the microscopic spaces in the wood were filled. It is theorized that the original wood acted as a framework to hold the minerals as they solidified, and the logs literally became stone with only 2% of their volume taken up by wood cellulose fiber.  

Used and carried by Witches and Occultist for healing and energy. Can be placed on the working area for added positive energy during ceremonies. Good for use in charm bags for healings and positive outcomes. About 1 inch.  Believed to remove petty annoyances, provide strength in all areas of life, be a stone for grounding, assist one to advance to highest chosen level.

Plants that flourished on earth millions of years ago are perfectly preserved as fossils. In petrified wood, the tissue of ancient trees is completely replaced by minerals, converting trunks and branches into stone. In some cases, the cell structure is so perfectly preserved that it resembles microscopic stem sections of modern plants. In some fossil beds of sedimentary strata, imprints of leaves and seed cones are so perfectly preserved that minute details are visible through modern microscopes. And of course amber (nature's transparent tomb) preserves ancient life so perfectly that DNA fragments within the cells can actually be extracted and sequenced.