sedimentary
Petrified Wood
Silicified wood (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale; displays varied earth tones of red, brown, and grey; vitreous to waxy luster; microcrystalline quartz structure with no cleavage.
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Physical properties
Hardness of 7 on the Mohs scale; displays varied earth tones of red, brown, and grey; vitreous to waxy luster; microcrystalline quartz structure with no cleavage.
Formation & geological history
Formed via permineralization where organic wood tissue is entirely replaced by minerals like silica, typically occurring over millions of years in alluvial sediments.
Uses & applications
Used primarily for ornamental carvings, decorative display pieces, jewelry, and high-end lapidary work.
Geological facts
Famous occurrences include the Petrified Forest National Park in Arizona, featuring specimens dating back over 200 million years to the Triassic period.
Field identification & locations
Identified by retaining original wood growth rings and cellular structures despite being completely replaced by stone; common in ancient river floodplains.
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