African Petrified Wood Agate 6mm Round - 15-16 Inch #9189 Opals are hydrated amorphous forms

Opals are hydrated amorphous forms of silica

according to the Mohs hardness scale

Sonora Jasper is the trade name for Sonora Dendritic

Rainbow Obsidian earned its name from the chatoyant

including Diamond

African Petrified Wood Agate 6mm Round - 15-16 Inch #9189 Opals are hydrated amorphous formsPetrified Wood Agate is formed from the petrifaction process of primeval trees over the course of many years. Petrification occurs when the wood is covered by sedimentary rock, as waters loosen and decompose the organic elements and replace them with silicate substances, while maintaining the wood's original structure. Preservation is enabled by a lack of oxygen.