fossil

Petrified Wood and Mixed Rocks

Silicified Wood (SiO2)

AI-generated identification · may be incorrect

Mohs hardness 6.5-7, dull to vitreous or waxy luster, displays preserved fibrous or cellular wood structures, colors range from beige and tan to brown, dark grey, and reddish tones.

Identified July 27, 2026More fossil →

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Physical properties

Mohs hardness 6.5-7, dull to vitreous or waxy luster, displays preserved fibrous or cellular wood structures, colors range from beige and tan to brown, dark grey, and reddish tones.

Formation & geological history

Formed when plant material is buried by sediment and mineral-rich water flows through, replacing the organic matter with silica, calcite, or other minerals over millions of years.

Uses & applications

Popular among rockhounds and lapidary hobbyists for polishing, display specimens, jewelry making, and educational fossil collections.

Geological facts

Petrified wood can retain cellular details of the original tree bark and ring structures down to the microscopic level, often preserved by microcrystalline quartz (chert/agate).

Field identification & locations

Identified by fibrous, woody grain textures paired with the hardness and weight of stone. Commonly found in sedimentary basins, riverbeds, and ancient volcanic ash beds globally.