Petrified Wood Slab, Madagascar (with stand) 4b22319f36edbcad6fd0674fa3989e4c Lake Superior Agates are the

Lake Superior Agates are the state mineral of Minnesota

and a void will not fill completely

needing no cutting or polishing

Ranging from light green-blue to deep blue

Petrified Wood Slab, Madagascar (with stand) 4b22319f36edbcad6fd0674fa3989e4c Lake Superior Agates are theFrom ancient Greek meaning "wood turned into rock", Petrified Wood is an unique form of fossilization. In some instances all the organic matter has been replaced by minerals (usually a silicate, such as quartz) during a process called permineralization replacement. However, many petrified wood specimens undergo a unique fossilization process, where silicates bond with the cellulose structure of the wood, thereby preserving organic matter. Regardless