From the Greek root petro meaning "rock" or "stone"; literally "wood turned into stone". The result of a tree having completely transitioned to stone. All the organic materials have been replaced with minerals, while retaining the original structure of the stem tissue.

Chemical Composition:  Fossil wood replaced by Chalcedony, sometimes also by Opal, Coal, Pyrite and/or Calcite.

Color:  Brown, Black/Brown, Cream, Tan, Red, Yellow

Metaphysical:  Grounding, Strength, Support 

Astrological sign:  Leo

Primary Chakra:  Root, Sacral, Solar Plexus