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Opals are hydrated amorphous forms of silica
Historically
according to the Mohs hardness scale
strong tropical wood native to the Philippines
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.
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