BOISF-G-01 Origin: Brazil Grade: A+ Dimensions: Approximately 30-35mm Weight: Between 15 and 25g Origin: Brazil Grade: A+ = very good Fossilized or petrified wood pebble approximately 30-35mm Colors and patterns vary from one stone to another Fossil wood is one of nature's many peculiarities. This fossil wood is both half stone / half wood. It is also called petrified wood, silicified wood, or xyloid. Indeed, the tree has transformed into stone through the process of petrification. The term petrified wood comes from the Greek petro, meaning "stone." Fossil wood is the result of a very long transformation that began millions of years ago, during the prehistoric era.