sedimentary
Petrified Wood
Silicified Wood (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, earthy to vitreous luster, amorphous crystal structure, and a specific gravity around 2.5 to 2.7.
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Physical properties
Hardness of 7 on the Mohs scale, earthy to vitreous luster, amorphous crystal structure, and a specific gravity around 2.5 to 2.7.
Formation & geological history
Formed when buried organic wood is slowly replaced by silica-rich groundwater over millions of years.
Uses & applications
Used in decorative landscaping, ornamental carvings, jewelry, and polished collector specimens.
Geological facts
The organic material is completely replaced by minerals while retaining the original cellular structure of the tree.
Field identification & locations
Identify by visible wood grain combined with quartz-like hardness and conchoidal fracture. Common in arid western regions.
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