Physical Properties: 	Crystal System: Trigonal 	Chemical Composition: 	 	Fossil wood replaced by Chalcedony and by Opal, Coal, Pyrite and/or Calcite. 	Mineral Class: Silicates 	Hardness: (7) 	Color: Brown, Black, Tan, 	Red, Yellow, Green, Purple 	Rarity: Common 	 | 	 	 | 	Metaphysical Guide: 	Primary Chakra: Root, Sacral, Solar Plexus 	Astrological sign(s): Leo 	Vibration: Number 77 	 	Fossilized Petrified Wood, which is also known as Agatized Wood, forms when a tree has died and silicon dioxide forms in place of the wood that degrades until there is no wood left, only Quartz.	 	 |