Rock Identifier
Petrified Wood (Silicified wood (SiO2)) — fossil
fossil

Petrified Wood

Silicified wood (SiO2)

AI-generated identification · may be incorrect

Hardness of 7 on the Mohs scale, earthy to vitreous luster, amorphous crystal structure, and specific gravity around 2.5-2.7 with preserved wood grain textures.

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Physical properties

Hardness of 7 on the Mohs scale, earthy to vitreous luster, amorphous crystal structure, and specific gravity around 2.5-2.7 with preserved wood grain textures.

Formation & geological history

Formed when buried plant material is slowly replaced by minerals like quartz over millions of years under anaerobic conditions.

Uses & applications

Used for ornamental carvings, high-end lapidary work, jewelry, and educational collections.

Geological facts

The organic material is completely replaced by stone, often preserving microscopic cellular structures of ancient trees.

Field identification & locations

Identify by distinct growth rings or bark texture combined with extreme hardness. Found worldwide in sedimentary rock layers.

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